So here's a quick update on the situation. I was finally able to catch the trigger and got him in a QT tank, I also had to move in my green mandarin in there. I brought the salinity down to about 1.018....scares me to death to bring it down lower than that. The ich seems to have literally popped, just few spots now. The fish in the main tank have been eating their pellets that I soaked in garlic extract. None are showing signs of ich so hopefully they will keep healthy.
Forgot to mention for the Tang problem, the water paramaters are 0 ammonia, 0 nitrite, 10 ppm Nitrate approx, pH its at about 8.1. I acclimated him, bag in the water, until temperature matched and then added minimum amounts of main tank water every about 3 minutes for an hour. He seemed fine for two days, he would even eat the algae from my live rock. Maybe the acclimation wasn't right, but its worked for all my other fish.
Forgot to mention for the Tang problem, the water paramaters are 0 ammonia, 0 nitrite, 10 ppm Nitrate approx, pH its at about 8.1. I acclimated him, bag in the water, until temperature matched and then added minimum amounts of main tank water every about 3 minutes for an hour. He seemed fine for two days, he would even eat the algae from my live rock. Maybe the acclimation wasn't right, but its worked for all my other fish.