My first reaction (if all your levels are zero) is likely the protomarin treatment. Protomarin only says that it's tolerated by coral, not loved. If you take a look at the compounds in it, they are all stressors. It won't kill things but it sure as heck will tick them off.
I'd recommend checking your parameters again, particularly nitrates. Make sure you leave your nitrate test for a good 15 minutes before determining the colour as the reaction is quite slow and in most cases looks like zero off the bat; the true story becomes apparent in a few minutes (I used to make this mistake). I often find my tentacled LPS (hammer, frogspawn and duncan) will be more retracted at higher nitrate levels. If protomarin can kill of ich, it can likely make a dent in a bacteria population (or other similar) and cause a bump in the levels.
A good, sizable water change and fresh carbon will help out if there are any nasties floating around from the protomarin itself, any toxins released by one of your corals because of the protomarin or if your 'trates are actually high.
Start there and see what happens. Try to not fuss around with its location too much; you'll just **** it off. If it like the flow before and you haven't changed the flow patern at all, it's likely not the issue. Also, just something to consider, make sure nothing is bugging one of your softies and causing chemical warfare; you'd be surprised how often this is the case.
Oh, and as blue tang suggested: If there is brown jelly on the torch that is a sign of disease. I didn't see that in your pic but just take a look.
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