I went from 2x96w PC's to 4x54W T5's on my 40g. 2x10k and 2xactinic. I'm keeping a very happy frogspawn, a very happy and constantly reproducing candy cane coral and a blue/green/purple acro, and some GSP. Make sure if you go T5's that you get the M shaped reflectors, not the V shaped ones and make sure they're the HO T5's and not the NO ones.
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