Yeah I also run 3 400W MH lights but that is on a 190g SPS tank Rusty. I looked for that thread on RC but couldn't find it again. This guy just ran about 8 T5's on I think a 100g tank and it was one of the nicest tanks I have ever seen. He was from Norway or Sweden I think. On a 20" tank you are probably going to get pretty good penetration with T5's
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