It's not a good idea to add more percs. Like you said, they are way to territorial and will kill any other clown. Especially in a 29. The diatoms are just part of your new tank syndrome. What type of cleanup crew do you have.
Your tank is still to new for an anemone. Anemones need a tank that is established at least for 6 months if not a yr. Clowns won't necessarily host in an anemone anyway. My clowns took a yr and half before they hosted in hairy mushrooms. Now they host in a frogspawn and a hammer.
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Peggy
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