Good luck with the river tank... I'd love to set one up but I am trying to set up a couple of new tanks already and get rid of the rest of my tanks... plus they are pretty rare around here (the loaches I mean). I;ve got about a perfect tank IMO for them though that would be cheap and easy to set up, a 40g long which is still 4' long but short and skinny. Something 100g or more is going to take a lot of flow!
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Keep us updated...