Most clown fish need a minimum of 30 gallons when full grown. One clown may be fine for a 9 gallon tank but 2 may push your bioload too high. Unless you have killer flow and a good skimmer and/or a huge sump. Here is a cool link to some great nano fish. http://www.liveaquaria.com/product/s...fm?pCatId=2124
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