Saw the word flow and got goose bumps! . My personal view on flow is you want enough flow to cover all areas of your tank to prevent any dead spots. Proper placement of the flow makes a huge difference so it's something to keep in mind. Sometimes its not the extra gph you need, but rather just readjusting your flow. I had what many may consider overkill or too much flow in my 38 gal, but everything responded to it just fine and had no issues. I ran a total of 9 nozzles that each could be adjusted independently pushing roughly 4,000 gph in a small 38 gal cube lol.
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small update moved the 2 powerheads I was using and added a 3rd sweeping one to break up flow and inteand to add another small one to blow behind the rock so nothing piles up so with just the three power heads a little over 2000 gph flow and the return line is pushing 650 gph and the other power head I will add will be around 450 gph all in a 40B. Sand is staying on the bottom and the few corals in the tank are open and happy.
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