Hi everyone im starting a 30 gallon saltwater I am going to do one predatory fish that can get along with others hopefuly and a few nice corals nothing to crazy. I was wondering what the cheapest light fixture is to keep coral. Also what kind of predatory fish could get along with a clown fish. and is there a specific way to stack live rock?

also i have a 200 bio wheel filter that does 50 gallons is that sufficient enough? or i herd alot of people just have skimmers would it be okay to just get a skimmer? and last but not least lol how many powerheads should I put in a 30 gallon and where should i put it/them

Lighting will depend on what you want to keep coral wise. From what you stated i think you will just be doing soft corals and maybe LPS (Large Polyp Stony Corals). If so, the cheapest lighting would be power compacts, but I would recommend a 4 bulb T-5 lighting fixture.

Ditch the biowheel and go with just live rock and a skimmer. 1- 1.5 pounds of live rock per gallon. You could also forgo the skimmer if you do weekly 5% water changes.