I'm actually wondering if maybe the 511 would be best for an adult? I'm thinking about upgrading now, because I worry about the ammonia content w/ the whisper filters. I like the idea of a canister filter too. I wish I knew about it before I bought the whisper filter :/ An adult turtle is an animal that creates LOTS of waste. I imagine frogs aren't much better. I would think for an adult you would need something with a little more power, no? Decisions, decisions. What do you guys think??





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