I could be wrong, but I think the move is a big factor, could have stressed them out. And while your numbers look good, they might be different from the previous owner's. You might doing things a bit different then he did, and that is adding to their stress.
Personally, I would keep up with water changes, and what not and make sure that everything stay stable.
Wish I could give you a more concrete answer -- like do X and everything will be better.
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But Todd is right --- mhurley
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