I have a 10" zonata, he won't tolerate anything in his tank. When I first got him he destroyed the decor in his tank, there was a large rock in with him and he shunted it around like it weighed nothing. I removed it as I had visions of it going through the side of the tank. He now doesn't freak out when I clean the tank. I have a sand substrate which he moves all over, the bubbler regularly get turned upside down and the tubing as been torn of the bottom (it was siliconed down). As he settled in he has become more inter active when he see's the food container he starts behaving like an Oscar doing that dance (you know when they are up and down the glass). I've become very attached to him.Thats him in my avatar.