I also have a 20gal and im using a 175w 10K XM MH (with 2 actinics) , its really nice. the extra light is great if u decide to go with some sps or clams. If u look around, u can prolly find some used MH stuff for the same price as a new set of PC's or T5's or u can try making a canopy urself. Only problem that could arise is higher temps, but that's easily fixed with a fan. Good luck!!
wally
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i want a tank i can swim in.
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