Well, I have had bubbles micro and otherwise in my tank for years, never saw a fish care about them one way or another! Don't you think surf makes bubbles on the reefs all around the world.
I had eight emerald crabs in my 90 gal. They seem to prefer coralline algae. Never saw any eat any valonia. One that got large killed my bubble tip anemone. Use caution with these guys and be suspicious of them at all times.
