And is it going to be ok for 2 Motoro Stingrays? I have fine black sand in their tank now and some sand floats at the top of the water because the Rays sift through it so much. It's time for a change. 50 pounds of pool filter sand is only $8. I will get 2-3 bags for my 180. I spent $80 + for 100 pounds of the black sand.





