Help with this coral

[byrdman81]

What exactly would cause sps to loose tissue in the middle of the coral. I don't see any red bugs. In this pic you can see tissue lose in the middle of the coral. I clipped off a
Section in the lower corner that had algae growing on it because it was dead all other coral seem to be fine and not affected by this.
http://184.72.239.143/mu/4a848176-19a0-c077.jpg
Alk is 9.5 ca is 440 mg is 1500 sg is 1.026 I bumped up nightly dose of two part and alk went up 1 dkh in 8 days. I dose 3ml of mb7 once a week and .2 ml daily of vodka.

[byrdman81]

Well problem is/was red bugs I bet. Found some on other acros. Treating with interceptor as we speak.

[Whisperer]

Red bugs affect polyp extension but do not result in loss of tissue. You might want to check for AEFW.

[byrdman81]

Well either way I spotted redbugs on other acros so treating with interceptor. Coral is almost gone today definitely rtn. Who knows the cause.