Is the epoxy made for underwater use? If not, that is why it isn't holding.
With the torch coral, look for good extension on the polyps and a good overall color. They are a pretty hardy coral, so I wouldn't worry about them. Your xenia does like a relatively lower flow, but can handle more. When the corals stop opening up big, look drab, etc. they that will be an indicator. Generally, you'll know when the corals aren't healthy.
My clowns host my torch coral. It has ups and downs I suppose. They have managed to kill off 4 of the 7 heads that the coral had, but they are still plugging away at the 3 that are left.
Here is a picture:
About the anemone, I would definitley hold off for now on the anemone. Wait until your tank is upwards of a year old before you add one. As far as more corals, you have a fairly wide selection with your tank. Check out the www.liveaquaria.com
pages for some general ideas of corals.
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