I picked up a small rimmed tank 56cm long 30cm high 30.5 cm wide going to use as a grow out/hospital tank it is a rimmed tank but where I am going to put the floor is tiled and some tiles are not 100 % level so intend to use some lef over insulation board which I would like to put the tank on so it won't be rocking on the tiled surface any issues in doing this with it being a rimmed tank.