Brew12
Electrical Gru
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Reef Tank 365
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My Tank Thread
I hate to say it, but I don't recommend trying to run this system as being ich managed, and you nail the reason right here. For the fish you have, the tank is just too small for any aggressive fish like damsels or clowns.The eventual plan for irradication: (Likely driven sooner if the ich return...)
While the Fluval EVO 13.5 is nice... I do feel I made the mistake of too small a tank... it's only 10 gal of water, no room for error, and physically small.
If I had to guess, the fin damage is related to aggression. The stress from aggression weakens the immune system making it very susceptible to parasites.
There also is no treatment that will work in your DT, so I'd recommend not wasting money trying. Unless you want to switch to a very non aggressive stocking plan, I feel going fallow and following a thorough treatment/QT protocol is your best bet.