Hey guys I was wondering what you guys think is the best sand for stingrays? I bought a 100 lb bag of my friend and he says one of his other friends uses it in a stingray tank and they do fine with it. I'm not really having much of a problem with the sand for the ray but ever since i added it into my tank i keep getting brown algae ever couple days all over my glass and decorations and its getting a bit annoying. Ive never had algae like this until i used this sand. My lights stay on 12 hours a day at most, some nights less. I do weekly water changes and clean glass and decorations all the time. Do you guys think maybe my town added something to the water and its causing algae?