I have a 55 gallon planted tank. I have 80 watts with a verlux natural sunshine tubes. I have a lot of algee that is on the back of the tank that I can't get to to scrub off because the tank is up against a wall. I have amazon swords, some other long tall grass like plant and some lily plants along with 3 red-bellied piranhas. I was wondering if there is any safe chemical I could use to get rid of the algee that won't hurt my plants or my fish.