Protecting Corals?

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I was tripping on my reef and I came up with a thought. Anybody out
there ever done or thought about sealing up the canels or holes in the
bottom of certain corals like Bubble or Hammer corals? I was thinking
when a Bristle Worm or other parasite can get into a killer little cave
where nothing can get to him and mine away at will, it is a good threat
to the health of the coral. If we could seal off most of the hiding
spots when we place a new coral, we could cut out alot of areas where a
parasite could hide. Then again you could seal one in and it will kill
on overtime.

Just a thought.

Sheldon