In my opinion think twice before you use this stuff. I've had southdown in my tank for approx 3yrs. now ,if I don't stick my hand in it and slowly turn it once in a while it clumps up. Whenever a powerhead or something falls of by accident it really stirs everything around producing a great cloud of debris which end up covering everything. I cant have any heavy flow towards the bottom because the sand moves from that area into or onto something.If you have something to trade such as inverts , I'll be more than willing to take 50lbs or more live sand out for you .Let me know .Thanks