Advice for a restaraunt tank

[iansfishy]

I have a reef tank in my house now, (with all the goodies) actually a couple tanks. Im planning on putting a tank in my restaraunt but cant decide between another reef tank or a fish only tank. with the latter i was wondering what equipment i could get away with to run a fish only tank. say about a 180 gallon. I cant spend as much time on it as my home tanks so i need to be able to have a sort of simpler system. Also not alot of room for things like a sump or alot of equipment. any advice would be appreciated. would something like a FX5 or a fluval 405 be sufficiant for fitration or should i be looking into something else? thanks