Ok, ive decided to convert my 75 gallon piranha tank into a FOWLR tank. I currently have an eheim 2215 canister filter, 200 watt heater, and an aquaclear 50 powerhead. I was thinking i would need to buy another strong powerhead, a protein skimmer, a hydrometer, a good saltwater test kit, a thermometer, then the live rock and live sand. Any suggestions or anything are greatly appreciated. Thanks for your responses, Chuck.