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Old 11-14-2011, 10:08 AM   #1 
mjoy79
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2.5 gallon filtered - 100% changes ever?

I gave my mom and my sisters my 2.5 tanks with a filter. I instructed them to do 50% water changes every week. I also recommended they do 100% changes every month. Was this wrong? I know without a filter they would need to do 50% and 100% each week.

Also would it be too much to change the filter out every other month?
Its funny, you think you know exactly what you're doing until you have to personally go and instruct someone else that hasn't been keeping fish in years!
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Old 11-14-2011, 11:40 AM   #2 
ANHEL123
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I personally love 100% water changes. I have 8 bettas , each in 2.5 gall and i always do 100% i want to be sure i get rid of all debris under the gravel. And my bettas in perfect health. But it me.

I change 2.5 gall every 4-5 days though.

Last edited by ANHEL123; 11-14-2011 at 11:42 AM.
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Old 11-14-2011, 11:44 AM   #3 
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Well as 2.5 gallons is too small to really establish a stable cycle, you'd be better off doing 100% water changes once a month or so.
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Old 11-14-2011, 11:51 AM   #4 
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I do 100% water changes for my 2.5 gallon once a week. The issue with 100% water changes is disturbing the cycle, which you probably won't have in a 2.5 gallon. Regardless, the beneficial bacteria doesn't live in the water. It lives in the filter, gravel, and on the glass and decorations.
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Old 11-14-2011, 11:54 AM   #5 
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Originally Posted by ollief9 View Post
Well as 2.5 gallons is too small to really establish a stable cycle, you'd be better off doing 100% water changes once a month or so.
BS. Its not the size of the tank, its the kind of hardware used in it. I've got a Tom's small sponge that I cut down to a 3/4" ring around the base and it can hold a pop bottle stable. The most common cause of the whole "too small to cycle" misconception is in tanks that are overstocked, overfed or too cold; you can cause an ammonia spike that triggers then exceeds the level of the bacteria's dormancy response. The low temperature of a goldfish tank is the primary cause of the water quality issues in them.

If biological processing was an afterthought or just something the manufacturer "hoped" the device would do, it won't happen. Easiest way to make it happen is wedge a nice sponge into the filter.

Honestly I do 75% water changes each week after my filters establish biological capacity. I always siphon to some extent and I usually disturb the bottom before removing water. Waving the siphon head around low before and while siphoning really fluffs all the lightly stuck stuff up.
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Old 11-14-2011, 12:00 PM   #6 
ANHEL123
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I do 100% water changes every 4-5 days for 2.5 gall and my bettas pretty old and healthy. And the oldest one about 4 years old already. And the youngest one i think about 2.5 years old so....
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Old 11-14-2011, 12:15 PM   #7 
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BS.
Charming. Thankyou.
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Old 11-14-2011, 12:23 PM   #8 
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I have to agree, this is a family site and "BS" shouldn't be a term used. Kindly give your opinion on cycling a tank that small and let it be that. No need of being nasty.

I have had a 1.5g tank cycle on it's own. But normally I just do my 100% water changed to get ALL the debris off the bottom of the tank. I do this once a week, and a 50% once a week on all uncycled tanks.

Bacteria may not be in the water, but removing too much water dries up the walls of your tank which holds bacteria as well. Bacteria is on all surfaces of established tanks. I do 2 25% changes a week on my cycled 29g because it's fully stocked and I don't want to dry out the walls removing 50% at one time.
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Old 11-14-2011, 01:11 PM   #9 
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I plan on helping my mom out with the first couple of changes, especially since I'll have the opportunity to be at her house over the next several weeks with family events going on. I will show her how to change out 50-75% a week as well as how to get all the "debri" from the bottom of the tank. The filters have small cut up aquarium sponges in them for added filter as well as to baffle the flow some.
I'll monitor to see if more frequent changes are needed.
I personally like larger tanks but I know that my mom and sister (at this point) dont want to do something larger and they're good with the 2.5G
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Old 11-14-2011, 02:45 PM   #10 
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I always feared that a 100% water change could be a bit of a shock to the fish and I never do more than 50% at a time.
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