I posted this over at piranhaforum.co.uk too, but I thought I'd get some more opinions.
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This is the tank, more or less, right now. 48 x 18 x 25, glass top, 48" fluoro strip (will probably dim this), megaflow.
I'm gonna run a 40-gal or so sump/fuge under the tank. I've ordered two emp 400's that I want to run in the sump (so it's not on the actual tank - along with the heater, just wanna get all the stuff out of the way to reduce chances of the rhom biting stuff/wires, plus it looks nicer).
Things I'm worried about
#1. Aeration. Should I put an airstone in the sump? And should I plant the sump? Are freshwater plants as effective as macroalgae in saltwater tanks in removing nitrates/phosphates? What else should I put in the sump/fuge - algae eating snails? I want to try and grow out this rhom, which means perfect water parameters, but I also want clear water so I can watch him in awe.
#2. Is this enough filtration? Two emp 400's in a 90-gal for one rhom? I'm going to get an iwaki magdrive pushing 600-800 gph for the sump, too, so about 7~9 times tank turnover an hour.
This is hopefully what my tank will look like when it's done.
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If there's anything wrong with the stuff I wrote or if anything's not okay or if I can improve anything, please correct me. Thanks for your replies.