I had a problem with my tank a couple weeks ago. I posted a note here and got some good feedback. I think what happened is when I added a new power head, it circulated junk on the bottom and screwed up my water chemistry.
I lost a tang the first day. My longnose hawk looked very stressed, but appears to be back to normal behavior. He used to come to the surface when I poured in thawed mysis shrimp. Now, he swims up, but is not feeding on any of the shrimp. He is starting to look thin now and I am afraid I am going to lose him if I can't get him back on the feed.
Any suggestions for getting him going again?