They require highly oxygenated water and will be the first to perish if the oxygen gets low from a warmer than normal tank.
Place a powerhead near the water line to raise the oxygen
level.
Thanks

Well I got home from work tonight and so far everything else in the tank looks just fine. I'll run some water tests tomorrow but I don't expect to find much. All the corals are wide open and the rest of the fish are eating as usual. It's too bad I didn't keep the fish as I could have done a little fish autopsy and checked for worms.
Hopefully nothing else will happen and I'll write this up to a real bad couple of days.

I wonder if they both ate something that disagreed with them? You haven't changed foods in any way (beyond the Cyclopeze...)?

It won't be an oxygen issue at I have a huge water turnover through my sump as well as two Tunze pumps in the tank itself. And from experiance it takes about a week of really hot weather around here to bring the tank temp up and that hasn't happened. Temp is right on 79 as usual.

I think if they had eaten bad food then the rest of the tank should be showing some stress as well. So far everything else is ok. Checked on them the first thing this morning and my other Tangs are fine. I'm wondering if I got an ammonia spike from the first one passing away. If my Foxface was a bit weak then that might have been what did it to him.
Who knows :question: