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					Originally Posted by JOSH
					
				 need something that pumps 300-400 GPH | 
	
 Why 300 GPH?  Hate to tell you this but you're screwed, you are looking at a Fluval FX5, a Rena XP4 (marginal) or an Eheim pro3 none of which are cheap.  I fyou need that kind of turnover for mechanical filtration in FW get a couple of AC110s and be done with it.  If it's for a SW tank I'd say you are probably over estimating the required canister flow unless you are talking about a 75 gal plus.  You'd be better off to go with a Fluval 405 ish canister and use powerheads to make up for the lower flow rate.  That isn't really an optimal solution though, you'd be far better off with a sump.