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I just sort of went over the same things in a different thread. Check this sight to see if you can find any culprits.

http://www.zoaid.com/index.php?modul...&g2_itemId=384

Thanks for the replies. To answer the behavior question. The tangs actually get along quite well. Everyone is fat and happy, and there is very little argueing. The occasional showing off and posturing, but nothing that turns into problems. Between a good skimmer and doing a 10% per week water change, the water perameters are usually pretty good. So i think there is something in there snacking at night. The snails look just like the good ones from your suggestions, so it isn't them. There is one worm creature I have seen a couple of times that might be like one of your suggestions. I will watch for it closely. Thanks again for the help.

I have seen some strange brownish redish flakey sort of small leaf-like things growing on the rock lately, and now some seem to be on zoo's that don't open. Has anyone ever heard of this before?

Sounds like flatworms.

who eats them?

a freshwater dip of the affected colonies/rocks might help. For one, it might flush out any hidden predators and two, it is a good treatment for any bacterial diseases that the zoos might have. I had a colony of zoos that was doing very poorly and never really opening and disappearing slowly one by one. A single freshwater dip for around a minute and now they're really on the rebound. Just my own experience, but another idea for you.