Just checking to see how the tank is coming along. Did you find out some of the regs and stuff that you have to follow? Did you make it to Modern pet yet?
What is q-sil and thicksil? Is this probably the formula they were using? They can make some really nice looking pieces.casting resin which you find by the surfboard repair stuff. I use this with q-sil and thicksil mixed with sand as well to glue the rocks together