if you want to use Coloured gravel, try Estes Brand.
I use the 'black special' colour (because I wanted dark substrate but didn't want sand) and this is what it looks like after 1.5 years:
it retains its coating no problem so far. there is the odd stone that you can see is faded a bit, but I think by the time the gravel is worn out, the tank will be too


I use the 'black special' colour (because I wanted dark substrate but didn't want sand) and this is what it looks like after 1.5 years:
it retains its coating no problem so far. there is the odd stone that you can see is faded a bit, but I think by the time the gravel is worn out, the tank will be too





