yeah, this is what i use, also easy to cut up and make frag racks hanging on tank, cages, whatever. the white ones are quite brittle when being cut, so i got more breakages. but the white ones are heavy, so can sink, which as good when i caged off my supers before on the bottom. these black ones tend to be blown off by the current ... forgot how much, got ém from aquastar before, yishun