Phosban, anyone useing it
 

Is anyone useing phosban in thier reactors. Started useing it about 5 days ago and my leather corals closed up. Does not look like they are shedding, they seem to be ****ed off.

I'm using Phosban, and I have a purple finger leather. It has seemed fine (been running about a week now)

It is totally normal for leathers to react like that to a change in water conditions. They sometimes close during a water change for no other reason then the water is different.