Well guys, I plan on starting an SPS only tank when I get back from the bahamas in 6 weeks. Its going to be a small 20G Long and will be strictly SPS, without fish as well. It will be a 30" tank so im looking for my best option for lighting. I currently run a Current SunDial 30" fixture on my 29G mixed reef and im happy with it but Id like to try something else. Should I go MH? i really dont want to deal with worse evaporation than I already have. Also this will be a sumpless system, as long as I dont have any fish/inverts I shouldnt have any issues running sumpless should I?