Yeah thats prob what was wrong with mine he just got bored. I would have the whole thing leveled off and by the next day the center of the tank would be empty with to giant slopes on each end got to where the rocks would tumble and he pick em up spit them to the top and there they would fall again. Dang I miss my fish I was sad when I saw him dead. I was shocked cuz he stopped eating and I couldnt figure out why like he tried eating but the pellets would float back out of his mouth but he was swimmin like normal. Next morrnin when i got out of the shower he was dead floating in that famous upside down U. Oh well he has no more worries now.
