@Andy_Tellem Hi Andy, Iโd stay well away from 3D back grounds - Iโve just ripped mine out.
My advice would be to use a black on the outside back and then lean a couple of bits of bog wood with plants on up the side - will make a much better visual effect.
@bolkE Yep, assassin snails. I got 40 of them for a 190 litre tank and theyโve done the job. Just donโt expect miracles, theyโll take some time to get through them all but will leave you snail free forever in time. (Apart from the assassins that donโt reproduce as often).