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Old 07-14-2009, 11:58 AM   #11 
doggyhog
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I have a two 2 gallons, and two 10 gallons. In my ten gallons I do 25% water changes every week, and in my 2 gallons, I do two 25% water changes a week and a 100%. It may seem a bit much, but the ones in the two gallons are rather sick.
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Old 07-14-2009, 12:01 PM   #12 
AlfaTheBeta
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thanks, good info
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Old 07-15-2009, 12:47 AM   #13 
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Not unless something drastic happens...I only changed mine 100 percent when I moved. You might want to do 50% or more if nitrate levels get too high. Check your water monthly and if the nitrates stay low with 25% water changes and regular cleanings (vacuuming the gravel and spot cleaning the tank) then you should be fine. The problem with drastic water changes in a tank is that it can cause an ammonia spike and kill your fish. Ammonia and Nitrite should always be 0 btw.

If you only have the betta, and I'm assuming plants in the tank, you will not have a problem keeping the tank healthy. Bettas don't produce huge amounts of waste like goldfish or plecos.
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Old 07-15-2009, 01:17 PM   #14 
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For a 10 gallon tank with a filter and only one betta, I'd say you wouldn't have to do a 100% water change... for a LONG time. I siphon about 20-25% of the water out weekley from my 10 gallon. I siphon 20-25% every few days for my 2.5 gallon. It's good that you're giving your betta so much space! :)
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Old 07-15-2009, 02:09 PM   #15 
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For a 10 gallon cycled tank 25% a week with gravel vacuum to get the waste from the gravel is sufficient. if the tank is uncycled and never going to be cycled (no filter) then do 100% weekly.

If you want to do a few 10% during the week by just scooping some water out and adding fresh that is also beneficial. I would not ever do a 100% change on a cycled tank as it may go through a mini cycle.
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Old 07-16-2009, 04:22 PM   #16 
AlfaTheBeta
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in about 2-4 weeks i plan on getting a ten gallon. right now all i have is a 2.5 gallon tank w/ gravel and two fake plants and a decoration, and a filter(wisper 2-10 gal)would my tank be clasified as a cycled tank? should i be doing a full 100% water change for my 2.5 gallon every week now that it has the filter?
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Old 07-16-2009, 08:46 PM   #17 
Red Betta
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Quote:
Originally Posted by Cerulean02 View Post
Wow 50%-75% a week? 100% on a 10g every month? Seems a bit much! I have a 10g tank and do 25% water changes a week and then just vacuum the gravel once a month...cleaning it 100% every month means your tank never really gets a chance to cycle because it can take up to a month to properly cycle.

I did 100% twice a week when Noel lived in 1g bowl, i would think doing 100% with a 2.5g once a week should be fine. I wouldn't worry about cycling unless you have 5+ gallons. The less water you have the more you have to clean to make sure there isn't a build up of waste.
As long as the filter, gravel, decor, doesnt dry up it wont mess up the cycle.
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Old 07-16-2009, 09:53 PM   #18 
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In my 10g that has quite a few fish I do a 25% change twice a week, but with one betta a 20% change once a week should do it
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Old 07-16-2009, 10:03 PM   #19 
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thanks
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