You already have a pretty loaded tank for a 12gallon. A good rule to follow is the "1-5" rule. You should have 5 gallons of water for every 1 inch of fish. I love frog spawn, it is my fav coral, but in all the tanks I have had I have never had a clown host in the frogspawn. So I wouldnt count on it, but it is a great coral.
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