Betta Fish Care  
Go Back   Betta Fish and Betta Fish Care > Betta Fish Diseases and Emergencies
Check out the eBook Betta Fish Care Made Easy
betta fish
Thread Tools Search this Thread
Old 03-23-2013, 03:47 PM   #1 
New Member
Join Date: May 2012
Unhappy Fish die within week of 100% water change

Hi there, I was hoping someone can give me some help.

I've had 4 betta fish over the past year or so. All of them were healthy and very interactive. However, each time I performed a full water change on my 2.5gallon tank, my fish would die within a week.

I made sure to gradually acclimate them into the new tank and added chlorine water treater, etc.

For my last fish, I was afraid to perform the 100% water change for this reason. I had him for 4 months and was performing maybe 1/5th water changes every few days. However last week the water was pretty dirty so I felt i had to do a 100% water change. Just found my fish dead this morning.

I am not sure what I am doing wrong and could use some help. Thanks.
Moby is offline   Reply With Quote
Old 03-23-2013, 04:44 PM   #2 
LittleBlueFishlets's Avatar
Join Date: Nov 2012
Can you describe your acclimation process in more detail? It sounds like something could be affecting them.

There are many ways to do a water change and acclimate (reintroduce) your fish back into the tank. Here is one variation:
  1. Note the temperature of the water.
  2. Using a plastic cup, scoop him, along with some of his water, into the cup.
  3. Clean out the tank. Refill with water at the SAME temp. Be sure to add the correct amount of water conditioner.
  4. Float his cup in the tank for about 15 min.
  5. Add a SMALL amount of NEW water to the cup. (Several tablespoons, or about 1.5 ounces.)
  6. Let his cup float for about 10 min.
  7. If the cup starts to fill too much, remove a SMALL amount of water from the cup. Discard it.
  8. Repeat steps 5-7, until about an hour has passed. (More time is always OK - there's no such thing as going too slowly.)
  9. Gently release him into the tank.

Since you were doing only 20% water changes every few days, it's likely that ammonia and toxins were at high levels in the tank. Then, if you didn't acclimate (or rushed the acclimation) during the full water change, that the new water chemistry could have shocked his system. In unfiltered 2.5 gal tanks, the recommended water change schedule is one 100% and one 50% water change per week.

Last edited by LittleBlueFishlets; 03-23-2013 at 04:51 PM.
LittleBlueFishlets is offline   Reply With Quote
Old 03-23-2013, 04:46 PM   #3 
Hadoken Kitty
Hadoken Kitty's Avatar
Join Date: Jan 2013
Location: U.S.
how often did you clean your tank?
Hadoken Kitty is offline   Reply With Quote
Old 03-23-2013, 06:44 PM   #4 
Join Date: May 2011
Location: Elk Grove, California
Hi Moby. I'm sorry for your loss. That is very strange, as many of us perform 100% changes without any problems.

My guess however, is because you were only changing out 1/5 of the water every few days, the nitrogenous waste built up a great deal. Although this isn't healthy for a fish, they do adjust to such conditions. If you change these conditions suddenly and drastically like a 100% change, it can shock and stress them and send their immune system into a tailspin. Thus, they get sick. :(

My best advice for you is to start doing bigger water changes at a time. When you get a new fish, immediately get into the pattern of changing at least half of the water on a regular and frequent basis, depending on the size of your tank.

In general, if your tank is 1.5 gallons or under, I recommend at least a 50% change twice a week or more. 2 gallons or over, 50% change once a week or more. This reduces the buildup of ammonia, nitrite, and nitrate which can all harm a betta.
Sakura8 is offline   Reply With Quote
Old 03-24-2013, 11:26 AM   #5 
New Member
Join Date: May 2012
Thanks for the feedback. LittleBlueFishlets I followed a process nearly exactly as you described. I think the problem may have been that I should have done at least a 50% once a week
Moby is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
100% water change? kandaila Betta Fish Care 10 02-02-2013 04:08 PM
100% Water change SamJustice Betta Fish Care 4 05-08-2012 04:02 AM
100% water change?? CrowntailTwitchy57 Betta Fish Care 3 06-28-2011 11:40 AM
Need help doing a 100% water change! ds2009 Betta Fish Care 11 09-30-2010 10:28 PM

All times are GMT -5. The time now is 12:50 AM.

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.