Generally I don't have a problem with cleaning my tanks but I was away for 2.5 mths and my friend who was taking care of my fish didn't clean the tanks while I was gone. I've done the much needed cleaning and water changes for all my tanks since I've been back but one tank has algae growing on the walls and I can't seem to get it off. I don't want to empty the entire tank to really scrub the walls and I've used the magnetic scrubbing pads but they didn't remove all the algae. Any advice? I'm not thrilled with the green glow the tank has right now.