Hey i was just wondering the easiest and cleanest way to add more black sand to the sand i already have in my 75 gallon tank that is already setup and i have 4 piranha already in the tank. i just dont wanna make the water all black and cloudy from the sand but i was wondering what u guys think i should do i hear that after i rinse it i should put it in a ziplock bag with a whole in the corner and put the whole bag in the tank and just get as low as i can and let it just flow out of the bag. i just wanna add more sand because i need more on the left side and i am gonna be adding more amazon swords in my tank and take out this big tree thing that they hide in because there still small and i know they wont be able to swim much with it in the carner when they get bigger, well if u can help me out i would apreciate it i a pretty much gonna do the ziplock bag idea unless somone has a better one thanks