We have two turtles - one Florida Soft Shell and one Red Eared Slider. We have recently started having a great deal of trouble keeping the Florida Soft Shell's tank clean. My husband has repeatedly cleaned out the tank but the tank continues to get cloudy and turn green within days. Last week, my husband scrubbed the tank down with chemicals, completely replaced all of the gravel and decor and purchased two entirely new filters with phosphate eliminators. (Sorry if my terminology is off.) The only thing that is the same is the turtle. Still, the tank has become cloudy and green in less than 48 hours. We have moved the tank to the basement so it is not in direct sun and we are out of ideas to try. The other tank has the same filter, gravel, location, etc. I was hoping you may have a suggestion for us. The turtle is approximately 17 years old and this problem has only been happening for the last six-eight months.