Hello! I have two 55 gallon aquariums and I have been dealing with crippling algae growth. One tank will regrow algae within days of removing it. My fish are doing good but the algae has made it so can't see into the tank. My lead suspicion is a nutrient imbalance because I have RO water with a mineralizer on it. All the windows are blocked off and my lighting has no affect on the algae growth. How can i figure this out? My other 55 gallon tank has loads of plants in it and it used to have the algae problem but I didn't do a water change in it for a few months and it is now algae free. Is that because the algae used all the nutrients and then died or what. Please help. Thanks!