Hi everyone! I am starting to get into the more difficult to keep SPS corals and most likely need to increase the flow within my tank. I have an all in one system, and when I first started to get corals I got a simple powerhead. So far, it has accomplished the job. It was rather inexpensive at the fish store and has kept LPS happy, but I do not even know how many gallons per hour it is. How much flow should I have in my tank, as a rate (gallons per hour, etc)? Also, any recommendations for a powerhead that would accomplish the job of giving the adequate high flow in a smaller tank? I don't want to break the bank and get a super expensive one, and I also want to be informed to not buy the crazy high powered one that blasts my fish around. Thank you all!