Sakrete, the makers of cement in those paper bags also has a cheap construction sand and a play sand. These have sharp grains and I think these would be harmful to the barbels of the Corys. I use it 50/50 with top soil, but only below a gravel top.
The filter sand found at pool suppy stores is more expensive but seems to be larger rounder grains and I think would be better suited for the corys.
Steve Pituch
The filter sand found at pool suppy stores is more expensive but seems to be larger rounder grains and I think would be better suited for the corys.
Steve Pituch