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Mysterious death

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608 views 10 replies 5 participants last post by  TripleP  
#1 ·
Hello everyone,
So i lost my betta a couple months ago, I had him for 4 years. He was my pride and joy and I was devastated when he passed away. I have never been able to understand what happened to my tank, and I am so worried about something like this happening again. I would really appreciate if anyone can help me figure out what happened.

He was in a 5 gal, heated, filtered, heavily planted tank with snails, a pleco, and 4 rasboras. This tank had been established, all water parameters were good, no issues concerns or anything funny going on for 4 months. Then, out of no where, I came home to one rasbora that had jumped out and another one that didn't look so good. Over the course of a week, that one rasbora stopped eating, got pale, eye started to go a bit clowdy, body slim looked a bit whiter on one side, lost ability to swim and keep elevation properly and then died. Then a couple days later another one stopped eating and then went through that painful process. Throughout this time, I used aquarium salt, tiny bit of melafix, or an antifungus and eye cloud medication (don't remember what it was called). I had a couple weeks where nothing happened so I bought some more rasboras because that poor thing was so terrified being all by itself and then a week later it happened again, they died off one by one until there was one left. Then my betta Rizo stopped eating..... I tried absolutely everything and looked all over the internet and called all the local shops but no one had any advice. He died the same way as the rest except it took him 2 weeks to go. He also got very bloated and started pineconing.

To this day I have no idea what happened.. The pleco and that one rasbora made it through all that. I gave up on the tank and was so sad Rizo was gone so I didn't do anything with it for 3 weeks. Then I felt bad for the poor rasbora and bought him some company and they have been doing fine since.

I bought 3 guppies though a couple weeks later once I realized maybe the tank was fine and 2 of them died like the others and the other one is totally fine. I didn't medicate the tank incase this was the cause for the deaths before.

So in my tank now I have 3 rasboras and that one guppy, the pleco (his name is Fin) and the snails who have all been doing fine for the past 2 months.

I am moving across the province in a couple weeks and I am going to give the tank to my dad (who has been doing the fish thing for 30 years) and I'm going to start up 20 gal tank fresh when I am all settled into my new place. I'm oping the larger tank will be more stable and that if I don't transfer anything over (like wood or plants) that the dying will stop.

My thoughts: I think there is some disease or virus in there, that only some of the fish are resistant to??

Any idea what happened??
For those sticklers and filling out the form... See below.
Housing:
How many gallons is your tank? 5
Does it have a filter? yes
Does it have a heater? yes
What temperature is your tank? 79 F
Does your tank have an air stone or other type of aeration? Filter shoots water into tank so provides aeration
Does your Betta have tank mates? What kind? rasboras, pleco, nerite snails

Food:
What food brand do you use? various, also weekly frozen bloodworms
Do you feed flakes or pellets? both
Freeze-dried? no
How often do you feed your Betta? How much? daily

Maintenance:
Before your Betta became ill how often did you perform a water change? weekly
What percentage of water did you change? 20%
Do you vacuum the substrate or just dip out water? did not vacuum, had substrate and too many plants too vacuum, plus sooo many nerite snails they eat any food the fish miss
What additives do you use? water conditioner

Water Parameters:
What are your water parameters? All parameters were within recommended range. Parameters while fish were getting sick were the same as months previous when everything was fine

Symptoms and Treatment:
When did you first notice the symptoms? Symptoms were stopped eating, paler body, clouding of the eyes, (for Betta he got bloated and started to pine cone), stopped being able to keep proper elevation and then death
Have you started treating your Betta? If so, how? Treated with aquarium salt first, then after a water change tried the antifungal and eye cloud medicine, then tried melafix as a last resort.
Does your Betta have any history of being ill? Nope
How long have you owned your Betta? Was he or she a rescue? 3 years. Was a Petsmart betta.
 
#2 ·
The some disease is what I'm thinking. I was suspecting the heater malfunctioning but if that was the case I'd expect that none of your fish would survive and you say that some like the Pleco have been doing fine the entire time.

If you want to keep the 5 gal, I'd scrap all the decorations and substrate, scrub the tank and heater, get a new filter, and start over.
 
#4 ·
Isn't dropsy a symptom of an underlying issue though? I'll go and read through the article you attached when I get home and not looking at it on my phone.

I appreciate your ideas and advice. I'd like to not be in fear of this happening again. It was devastating.
 
#5 ·
True, but there are cures and prevention measures available just for the dropsy itself. Since it's the only thing I can ID, I put it up there.

Here's a side note: I know what happened was weird, but as for Rizo I think you've done all you could. The guy was 4 years old, plus however many months or years he spent before he came to your life. It's... well, about time. Don't beat yourself up, alright?
 
#6 ·
Did you say a pleco?
I would say a solid 55. A friend of mine has a HUGE pleco, about 13 or14 inches and it's in a 50 or 55. They need to be the width of the tank I believe. So a 15" wide tank.
Plecos can get MASSIVE! They are notorious for eating the slime coat off fish. Gross.
Your betta probably died of dropsy resulting from old age. You gave him a good life.
I'd say rehome Mr/Mrs. Pleco ASAP. Your pleco might've been sucking on your rasboras, causing them to be stressed and more susceptible to illness.
 
#7 ·
Did you say a pleco?

Plecos can get MASSIVE! They are notorious for eating the slime coat off fish. Gross.
Your betta probably died of dropsy resulting from old age. You gave him a good life.
I'd say rehome Mr/Mrs. Pleco ASAP. Your pleco might've been sucking on your rasboras, causing them to be stressed and more susceptible to illness.
The pleco has never harmed or been near the fish, he does his own thing. I don't think he touched them. I am aware that plecos get big, but for now he is an inch long and he will soon be going into a 20 gal and when he outgrows that he will go into my dad's 155 gal.


The dropsy doesn't explain why all the other fish. Saying he had dropsy is like saying a person has a fever, it's a symptom of an underlying issue that the body's way of coping with the issue, that can also be a source of death. There was something that caused him to have dropsy and caused all the other fish to die off.
 
#8 ·
I know he lived a long life, but I'm trying to figure out what went wrong so I can prevent it and hopefully won't have this issue in my sorority. Ideas and thoughts about what happened are greatly appreciated.
 
#9 ·
I am not sure what happened unfortunately. I am not the best with diseases. While your betta was getting old, the others dying as well points to something contagious in your tank. The few that lived may have had a better immune system and been able to fight it off.

Also, while I am not saying it's what killed your fish, your tank was highly overstocked. According to calculations, even without the pleco, it was at 256% stocking level. That many fish in that small a space may have stressed them even if you didn't notice it and that could've lowered the immune system. Or it may have not contributed at all but I thought I would mention it. Here is a great website, highly recommended by many aquarists to calculate the stock of your tank and give you pointers on what fish live well together. It may be of help in the future.

http://www.aqadvisor.com

I am very sorry for your loss. I haven't lost any fish yet but I know it will be hard when it happens. I wish I could be of more help. You may could try making a thread in the disease and emergency section, others that frequent there may have a better idea of what happened. I personally would be hesitate to add anymore fish to the tank until you are able to pinpoint what is going on.
 
#10 ·
Highly over stocked...? An inch if fish per gallon is what I've always been told. 4 not even 1 inch rasboras, 1 2 inch Betta and a 1 inch pleco = less than 7 inches in a 5 gallon. That's not 256%

Regardless, I am good about doing water changes and had a successful tank for a long time like that so I dont see why that would be the cause. Ammonia levels were never ever high, or even detectable and there were so many plants and snails keeping the tank water quality perfect. if I had plastic plants or plain rock gravel and not a heavily planted tank with substrate and consistent water parameters I could see this being an issue.

The point of this thread is to identify what kind of disease or virus that went through the tank so if I start up my 20 gal I can take my pleco over without risk of harming the fish in the 20 gal and so my dad can take the other fish in his 155 gal.
 
#11 · (Edited)
All I did was put in the information you gave into the website and calculated it, that is where I got the 256%. The inch per gallon rule is a guideline but it doesn't always apply, esp. in the smaller tanks. There is a lot to consider when adding fish, not only the added bioload. You also do have to calculate the snails into the equation when stocking your tank. They eat algae but are often high waste producers. Most do recommend a minimum of 10 gallons before you add fish in with a betta, but ultimately that is your decision obviously. However, I didn't say it's what killed the fish, just passed along the information in case in may be useful to you in the future. Nothing more.

I do agree that it appears to have been some contagious disease but as mentioned I am not very good with the different diseases. There are members on here that are very good with identifing the different diseases, posting in the disease section may help them see the thread and respond. Is there perhaps a way you could transfer the remaining fish into another tank, treat them with a broad spectrum medication to cover most the bases and while you are doing that completely break down the current tank and sanitize everything incase whatever illness it was still remains in the tank? You may have already tried that but I thought I'd mention it in case, other than that I don't really have many suggestions unfortunately.

Edited to add - Also wanted to mention I wasn't sure of what kind of rasboras you had, so I may have accidentally chosen ones that grow bigger than the kind you have and that would have caused the calculation to be higher than it actually was.