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Thanks for the response. I figured they might be for that type of setup. I have one on the left, one on the right, and one in the midde. I was thinking that it was maybe to drain and one return. But since they are in the very bottom of my tank, how would I keep the substrate from heading down...

I am completely new to salt water as I have always stuck with freshwater. However, I have recently acquired a 150 gallon and have decided to take a stab at the saltwater world . I have been reading all day about how to get it started, because I want to try and get the tank set up and running the...