I've got 2 pieces of pipe for my axie which although doing the job are not the most attractive things I've ever seen. I was wondering if I sould use a terracotta plant pot instead to make a cave and embed it in the sand? Would this be ok if it wasn't varnished, would that be better, I don't know if it'll effect the tank? I have also seen things with half coconut shells used as a cave, would this be better? If anyone knows of a natural or at least natural looking aquarium cave that'll fit in a 18x10x12in tank and obviously give alfie space to move that would be great too!!!