02-23-2010, 07:54 PM
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Well I think it makes sense that changing less often would lower the PH...
As far as Water changes, I'm not sure. I've heard every opinion, from once every 6 weeks to never. (in a heavily planted tank, that is. Wouldn't apply to tank that wasn't planted.)
Personally, I'd say test the water, and when the nitrates start to appear, change it.
As far as the fishies swimming in their own gunk, it's not really "gunk" after the bacteria get done with it.
I could be wrong, but the main reason anyone changes the water is to get rid of nitrates. Everything else is broken down into other, somewhat useful or inert substances.