With an 18g tank my suggestion would be to put the fish in first and let the system equalize as far as bacteria to process the ammonia, nitrite and nitrate. With that size tank and 2 fish (and the food you feed them) it may take 3 or 4 weeks for things to work themselves out and stabalize. Then I would start adding coral - maybe some xenia, mushrooms, gsp or whatever other soft corals you like.
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