so i figured out my tap water is my main problem i have 1ppm PO4 and 20ppm nitrate in my tao water which is causeing some SERIOUS brown algea and such.... so i was suggested to add a reverse osmosis unit since the tap water is my problem<br><br>now how do i know which size is needed GPH wise with how many canister's, and how do i hook it up to work properly.... i have a 72x19x24 tank so roughly 140-150gals, and i use a python to change water weekly, how do i hook it up ?? i was told it for when i re fill my tank it will tke the impurities out before they get into my tank but how do i hook it up do so ?<br><br>any help would be great thanks, im a total newb for reverse osmosis