I have recently added a Dat to my collection and I will say I am new to Dats. Any way he is rubbing on the wood in the tank. I have checked him out several times and I can't find a mark or a spot or anything that would tell me he is sick. He appears to be healthy other than the rubbing. He swims around, eats a little but not a lot. Any thoughts or recommendations. As I mentioned I just got him within the past week and he is about 3".