Help with receding candy cane coral

[reef-keeper]

From what I've read reef crystals have higher calcium and magnesium. Salt is designed for reefs. Also could it be your lighting?

[Reef Pilot]

Are any of your candy cane heads getting stung by sweeper tentacles from neighboring LPS? They come out at night, and can reach out pretty far sometimes.

[edikpok]

I bought a bucket of Reef Crystlas - will give this a try. Measured Mg today and it was quite low - 1100. With weekly water changes, one would think that no dosing is requried (and this was the case in the past). However, perhaps the IO batch that I used over the past 3 weeks had low Mg.

As for the lights, I change the CF bulbs every 6 months and these ones are only 4 months old.

Also noticed today that a few other corals started receding, so whatever the problem is, it is systemwide-hopfully the new salt will help it.

Anthony, I will PM you.

[Reef Pilot]

Well, if it spreading to other corals, that is serious. Your sg is a little low at 1.024, although not sure if that is enough to cause a problem. Are you using a refractometer?