08-06-2012, 12:15 PM
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They CAN live in a full marine tank. But first I'd research if it won't eventually eat anything in your salt water tank. That'd just be a pain.
Then, you must slowly increase the salt... 1.001, 1.005, 1.010, 1.015, until you hit the point that your saltwater tank is. You could probably do this all in the 20 gallon tank.. but again, it recommends raising up the salinity over a course of 6 months, probably a bit longer if you want him at full marine level.