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I'm running mine on 3 in a 75g tank.
And you aren’t blowing sand around?
No sand blowing. I have the return line shooting across the length at top of the tank... not aimed downward at all. My gyres move the water around the tank.
I have about 4 feet of head pressure which reduces the pump slightly. I used to have it only on 2, but wanted to put a little more flow through the sump due to cyano in the sump... just never put it back to 2 since all was going well.