I put a gbta in my tank 4 days ago. It attached wherre i placed it. The next day it moved about 3inches over and attached there. lLast night it moved again behind all of the LR. How do I get it to the front of the tank again? I dont want to damage it so is there a way to get it to move by it self? It was in a tank with 250wMH and I have 205 w t5. there is very low flow behind the Lr