acans are going for a frig receeding I Can't speak.
 

Acans are starting to receed and I dont know why,...
all levels are perfect IMO\
cal 450
ALk 8.6DKH
ph 8.1
temp 78
PO 4 0ppm
NO3 0
NO2 0

Fish or shrimp that could be picking at them?

what kind of test kits are you using? are they still good (ie. not expired) - I have read a few stories where tests looked good but upon further inspection the test was useless.

See if you can borrow a kit from a friend to test your parameters. Is there any other issues in your tank (algae, other coral acting up?)

cheers;

vince

What's mg at? Sorry to read more bad news man. Is there a skimmer on the tank right now?

Have you changed the lighting? maybe your water is too clean. I've noticed my acans do better in my tanks that aren't skimmed as much, which I guess means there are more nutrients in the water. Are you still getting feeding responses?

yes there is a SWC 160 cone on there now i have scaled down the skimmer . may be the water is to clean. the mag is around 1350 Brett

Perhaps that dufus is harassing them again.

Has anything changed in the last few days. Changed carbon or something?

any coral warfare going on ? stinging sweepers ?

Ya, didn't you put that tang back in?