I just installed the ato. Looks like it is working properly. I had to mount the hose on the wall of the sump because it keep going into the water and I would get a back siphon.
They other night one of my blue chromis came out from the rock work and it looked like he had black marks on his body. It almost looked like he got beat up. The next day when the lights came on he looked fine so I thought maybe it was some shadows or something. The two chromis spend most of there time in the rocks at night so I did not seem him again in till now. Again it looked like he had black marks on his body. He looked completely fine today no discoloration. Any idea what it could be if anything?