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Still waiting on this to open up more. I think I have it to low. I placed about 2" above sand. There's a decent amount of low flow across and around it. Nice hanging an empty tank I can put it anywhere lol. I do have a spot about 9" high. I'm thinking it'll def have better par there. I may try to just take the truck it's on and put it up there for a few days and see. The flow would be medium/low there.