Welcome to Canreef! If you only plan on keeping soft corals and an anenome I would get a T5HO light fixture. You can get 4 bulb 24" fixtures for well under $200. If you want a MH get it, but they can can heat up a 20g tank real fast on hot days. I would also recommend waiting a least 6 months before adding an anenome or it will perish. Most people claim they only want soft corals but that usually lasts about a month before wanting to get into LPS and SPS. A 4 bulb T5HO fixture will let you keep most corals as would a MH. You can sometimes pick up used Sunpod MH fixtures for cheap on this site as well as others.
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