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You really should keep the 120G. It won't be long and you will hate yourself for doing a 55G. No room front to back and hard to decorate.
Also, The larger the volume of water, the easier things are to maintain. PH, Specific Gravity, Calcium, temp and all are a lot easier to keep at proper levels in a larger tank.
I do know what I am talking about. I too had a 55G and hated it with a passion because of the size constraints. I then went to a 75G which I still have and a 120G which I love. I currently have 3 75G reef tanks and the 120G. I would never do a 55G again. Big Pita!
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I Keep looking at our in ground pool and wondering how much Live Rock I would need to make it a Reef!
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