What I did, although I can't keep any lps corals is just used my top that came with my 10 gallon setup from Walmart, spray painted the inside white and got 2-20 watt 50/50 screw in lights. There is a great series on you tube called nano lagoon that's pretty much a step by step setup for a budget nano reef. Although I did add a nano modulus 240 and just went with a aquaclear 30 not modded at all. My tank is 8 months old and thriving! If you can go bigger try, I'm in the middle of converting a 20 gallon long because you run out of room fast and you always want more! Best piece of advice is take your time and go slow!