I'd call ESU (Coralife). Everytime I call them about a broken impeller or anything related to the pump they just send me a new pump. No questions asked! They never even ask about warranty. They are just great people to deal with IME.
To directly answer your question I am sure A MJ 1200 would be too much flow for it. Research the GPH of the stock pump and then find one that matches that GPH.
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I wonder how much salt mix I would need to turn our in ground pool into a Reef.
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