I'm currently in the process of setting up a 55 gallon. 48 1/4 x 12 3/4 x 21 I was planning on moving all the stuff from my 29 gallon into it and have some upgrade to do. The 55 was previously a cichlid tank and I had 130 watt pc lighting on it. I moved its lighting over to the 29 gallon and used t8s on the 55. Now its empty and I need to figure out what kind of lighting I will need to either supplement or replace the pcs. My plans for coral stocking are mostly going to be zoas, mushrooms, leathers, xenia, and a couple lps( frogspawn or hammer and foxglove.) My biggest concern is my electric bill and the heating it will produce so metal halides are out so its pretty much down to another pc fixture, t5 or a diy led kit. I read the thing with led vs mh and the biggest thing I still don't understand is how many LEDs I would need on a smaller tank like mine. It seemed everyone in that tank had an odd sized tank or a 90 gallon or better. LED would give me the most options but would be the biggest pita to do.