I have 4 angels and all 4 of them eat acros....I don't trust angels as far as I can spit

*edit*It was an overnight occurrence with my regal angel too. She lived with the corals for months before deciding to start snacking

Did you have decent PE with this tank previously?

$20 says its evil red bugs :neutral:

Are you feeding your corals? I had fading PE extension problems as well, especially acros and milli's. Pursued ULNS to the nth degree and ended up starving my corals. Since greatly increasing my coral feeding PE is way better.

something new electrical or something started leaking stray voltage ? maybe test with volt meter

Some thing i did to increase PE is heavy skimming, run GFO and carbon. Also notice that phos xtra, coral snow, and other KZ products made a difference as well.

What brand of salt do you use? And have you purchased a new bucket/bag at all recently?

Yes It was awesome for several months until I added the PB tang and had the resulting Ich problems. If I remember correctly I did a waterchange and started adding garlic. I seem to remember thinking...HMMmm it seems "Marie's" coral doesnt like garlic, the pollyps have all closed up. coincidence?

Nope I dont feed them, I am not running a ULNS system at all. I feed 2x a day, flake/ pellet/ bbs/ homemade mix.

no but its a possibility. Wouldnt that affect all of the corals tho? How do you check it?

I am skimming pretty good, also running new gfo and carbon and taylored aquatics phos destroyer.

I used to use IO but cant get it anymore so I switched to Seachem reef, but not sure when although it may have been around the same time. Because i remember checking the Mag content of the first batch and thinking it was really low. Turns out my mag kit was going bad and I was getting low readings on the tank too, thus causing my possible Mag overdose. I have let it lower itself slowly by not adding any new Mag suppliment for a month or so. I have switched now to Seachem marine salt to see if perhaps the last pail may have been bad.???

I've read of a couple instances of people using Seachem Reef salt and having disasters with their SPS. I have used it for the past year and haven't been thrilled with it. I recently purchased a bag instead of a bucket because I plan to change salts and have started to experience STN in a couple mini colonies. I certainly can't say for certain if it's the salt but I don't plan to keep assuming it isn't - I'm changing salts.

I tried the seachem a few years ago and lost some SPS (and I was only doing 10gallon waterchanges at the time). I immediately went back to IO and eventually mixed the two to use up the rest of the bucket. I've also heard from others that they had problems as well as people who love the stuff. Not sure what was wrong with my batch.