I have a 150 gallon glass with no background. I have moved several fish from that tank to a 60 gallon acrylic tank with a blue background. Every fish that I moved into the acrylic tank with the blue back has totally freaked out. Hiding, smashing into everything, total freak out. It seems that it mostly happens when I enter the room, the tanks are not in the same rooms. Has anyone experienced anything like this? Any ideas why this is happening?