hi my corn has suddenly stopped eating,ive checked temp an its fine,nothing i can think off has changed!!my other is fine but this one has me real worried!!hes bout 4 an half foot,i know they slow down this time off yr but its been bout 8 weeks now!!an like i said my other is still eating!!all he does all the time is rub himself all over the front of his tank like hes trying to get out?please help cause im soooooo worried!!thanks x