if you have microbubbles going into the tank and lack of flow those tiny bubbles could stick right onto the tips of the corals.

Microbubbles, bryopsis are the only two things I can think of to explain that.

More flow us needed I'd think.

Its micro bubbles, I used to have the same problem!

i have that problem when the water in the fuge gets low and the return pump puts micro bubbles into the tank.

micro bubbles agitate corals and make them slime, mostly

looks like microbubbles colecting on the corals to me, I had that problem when I first set up the old plumbing. The corals catch them with the stickeyness(or how ever the polyps hang on to them) :mrgreen:

Steve

I guess it's the same old problem, more flow without knocking everything over or kicking up sand... I guess I should have done a closed loop! :biggrin:

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Thats exactly what it is. Bubbles getting trapped in the slime coat of the SPS. A turkey baster should keep them free of this but you might want to adjust your flow and micro bubble issues.