okay so i just moved my old 36 to my 90 and he keeps moving to the back of the tank no matter what when hes not planted i try to sway hom 2 the front but he gets planted then slides himself threw the cracks between seperate rocks and finds his way to the back. theres normal lighting bac there because the rock isnt riteup against the glass and not much above where he goes but is it because of a higer flow rate hes going there? or what? i jsut wish hed stay in the front where i can keep an eye on him