I have a dual layer of gravel, with rounded sort at the top and underneath that a more gritty layer to help plant growth. However, when I clean the gravel with my suction device, some of the lower substrate seems to inevitably get churned through a bit. At the moment it's not a problem, but I hope to keep corydoras catfish when the tank is mature and don't want them to be on the sharp gravel.
So I had the idea of placing a sort of paving of bits of thin slate between the layers to stop this happening, then I thought well why not use plastic to keep the weight down? But is all plastic safe to use in aquarium water or will some types leach chemicals into the water?
So I had the idea of placing a sort of paving of bits of thin slate between the layers to stop this happening, then I thought well why not use plastic to keep the weight down? But is all plastic safe to use in aquarium water or will some types leach chemicals into the water?
