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Old 07-20-2011, 12:23 PM   #11 
Neil D
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In an uncycled tank, you need 100% changes. 50% changes only reduce the amount of ammonia. They don't remove the ammonia.
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Old 07-20-2011, 12:24 PM   #12 
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Originally Posted by Neil D View Post
Yes but I'm assuming a 2.5 g isn't cycled. I think u may need to reread the cycling thread
50% changes on a filtered tank otherwise it's probably never going to cycle. you can get a cycle on small tanks, it's just not as stable, which is why you still have to do twice weekly changes
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Old 07-20-2011, 12:26 PM   #13 
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I'll find the thread. Anyways, I never do 100% changes if I can help it, stresses the fish out and I get all those dumb gas bubbles. I do 95% changes.
if you let the water sit out for 24 hours you shouldn't get bubbles :p
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Old 07-20-2011, 12:29 PM   #14 
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I tried that, still got them. Also, if I let the bucket of water sit out too long, it gets a fine coating of cat hair even with something over it. Hate those bubbles.
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Old 07-20-2011, 12:32 PM   #15 
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oh my. this thread is getting confusing. I've mostly read on a filtered 2.5 to do 50% and then 100% changes weekly. I hate to stress my guys out though on 100% changes (which I used to do all the time, until I came here!)
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Old 07-20-2011, 12:42 PM   #16 
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They shouldnt stress too much. But you have a filter so my personal recommendation is to do a 100% change weekly.

It's hard for a new fish keeper to cycle a 2.5 g, not to mention in a tank that small, it's fairly easy to do WCs.
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Old 07-20-2011, 12:42 PM   #17 
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I think there are definitely differing opinions. Mostly what I've been told is not to do complete water changes on cycled/filtered tanks because it removes too much of the beneficial bacteria that is in the substrate. Really, though, I would just advise everyone to do what they are comfortable with.
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Old 07-20-2011, 12:58 PM   #18 
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I don't think 100% is necessary on a 2.5 gallon filtered tank...I have a 2.5 gallon filtered and my water stays perfect with two 50% water changes weekly...one with water only and the other with gravel vacuuming...
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Old 07-20-2011, 03:24 PM   #19 
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Okay. I think i see the confusion

Filtered: your tank has a filter.

Cycled: your tank has a filter and has large amounts of BB

You can have a filtered, UNCYCLED, tank.
You cannot have a cycled tank without a filter.
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