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What kind of fish in a no-water-change tank?

Off and on people there's been some discussion about water changes (or lack 

I'm just wondering, for those of you who just do top-offs with r.o., and 
infrequent or no water changes, what types of fish are you keeping in these 

Just curious whether anyone's attempted to keep *sensitive* or *difficult* 
fish without diligent attention to water changes.