Want to hear feedback from those who have put pool filter sand in your aquarium vs. using a proper aquarium substrate. I've read here and there, that, after some time, brown algae starts to appear with pool filter sand. I'm going with sand in my 240 freshwater and am leaning towards staying with Estes or an equal. I don't care about the cost as I know there's a big difference in price. Would love to hear from those who have had it awhile in their tank. Thanks.