I just finally cycled my 20 gallon tank. I was planning to have a fish only, but re thinking I may want to later add some easy to keep corals. My tank consist of live and dry rock with a crushed coral substrate. I run a Tidel 55 filter that does a great job, and a Fluval flourescent light fixture. First question what fish (other than Clowns) would be good for starters. Secondly what simple light upgrade, that wont break the bank, if I add simple corals. Thanks for your input.