[How much current is needed in a well rounded reef tank? right now for a 150gallon tank I just have besides my 2 locline returns said:[Depends on the corals you have. Most soft corals 5x to 10x is fine. For SPS, 10X is probably a bare minimum. I have about 20x volume turnover on my tank and IMO its just approaching a reasonable level. But there are so many factors like coral growth patern, type of flow, where the flow is pointed, etc.]