ok about 2 or 3 months ago my red zebra started rearranging the gravel in my tank, my view for the most part is go nuts make your self happy, except hes getting a bit carried away. Moving all the gravel in 6in circles all the way down to the glass so its like almost a 10 in diamater crater. Now is this normal or is he unhappy with something in the tank the water paramaters are fine. I just rearrange how my tank is but took out the cheesey fake decorations and am going for a more natural look (will post some pictures later, camera batteries are dead). Well just curious if this is normal or do i have problems. Oh btw i have had him about a year and hes about 4 inches long.