Help! Start of Slow Tissue Necrosis Event?

[Seafan]

Hi, two things about your post that jump out at me, may or maynot be causing the issue;

1. is that you have doubled your tank size, but not your lighting, so you've cut their light by half.

2. Has your alk always been at 7? seems a tad low to me, and out of balance with your calcium.

sure hope it's not an stn event, and that it turns around for you.

[whatcaneyedo]

When my corals have done that its because they weren't receiving enough light and/or flow.