Just a shot how much carbon are you running and what type? I added some pellet carbon way to much to my sump the next morning my xenias were shriveled up, torch, Duncan and leathers, glove polyps all withdrawn. Everything was hurting except sps
's. I removed it did a 25 gal wc
a week later everything is almost back to normal. Xenias were losted. Now I just run one unit of chemi pure elite in sump. I always run carbon that time I packed a filter bag full like two cups of the pellet kind it stripped the water.