I'm not a fan of the api tests myself, as I've noted ammonia in freshly mixed salt water although the RO tested clean.api is not good for trace amount of ammonia or nitrate, although apears to be some in the pic. I'm ok with api for quick ca, and alk readings and when cycling a tank cuz they are inexspensive.
Adding ICH as an afterthought is kind of sad as sick fish to start out means that it doesn't take much for additional problems to be much larger than they might have been.
I'm hardcore on ich and don't in any way believe it is in every tank. Opinions differ and I won't argue them, as I have as little proof for what I believe as someone who believes the opposite. All posted from here on out is my opinion (as with anything I post really, but I won't defend it or fight on ich if/when someone disagrees. This can be a hot topic, and I just want to make clear that I don't want to engage in an argument)
If they were my fish, I'd pull them all to QT and treat. Tangs can be fussy about copper, so I'd look at hypo, tank transfer, or cholorquine phosphate. Your tank has ich, not your fish, and while you may not see signs of it on the others, it is likely in their gills, causing your current problems to be exasperated. Your tank will need fallowed for 11 weeks or so to cure it, and that would give you an opportunity to experiment with the sump (I don't know that silicone) without causing further issues with the fish (corals are another story)
Reef safe ich cures are snake oil (again, my opinion), and the garlic folks should read the studies about terrestrial lipids causing liver damage when used for extended periods (opinion)
If you need to use silicone, stay away from the box stores. More people get in trouble than get the right stuff, if there is any.
http://www.amazon.com/All-Glass-Aquarium-AAG65010-10-3-Ounce/dp/B0002ASD34
http://www.grainger.com/search?searchQuery=momentive+rtv+108
You talkin bout me Willis?! Lol
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