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You have a 20g high, same thing I have. Your light is OK, could have gone with a 4x24w T5 HO fixture and had better results and a wider variety to choose from though. You should be fine with softies and most LPS.
lol seems there is always bigger and better...i dont think their was much better for a 24'' at the LFS, besides metal halide and that imo is over kill for a 20g tank and $400 more