I’ll keep a closer eye on them I have lots of clowns who are just discovering hosting now. Trying out zoas even. ThanksMay seem silly but any chance you have a clown fish messing with it? I've had my Duncan for a few years. Mid way up and high flow area. I had some issues when my clown kept ramming into the Duncan maybe trying to host. Idk! Maybe you have a fish messing with it. I took the clown to the LFS and haven't had any issues at all.