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It is me again. I was wondering what kind of substrate I should use and how much. I have a whisper 20-40. Wondering if I can use that or do I need one with a bio-wheel? Thanks for the info about the live rock.

I am new to the saltwater world. I know it is not recommended, but I need some ideas of what I should get to set up a fish only tank. It is only 20 gallons. Want to keep very simple. My wife says if I can keep this one going, then I can get another aquarium. Any help would be great.