Higher K, more watts. Simple. I have a 16 gal nano with a 175 watt 20k and it looks great, and growth is good (1 polyp candy has grown to 19 polyps in 8 months, 1 polyp torch to 4 polyp in 6 weeks). I am upgrading a 400 watt 20k so I can keep SPS corals (I say Josh's cat's paw and fell in love!) But that's my 2 cents... 20k all the way!
-Pauli
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Have a good one!
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