I was given a juwel rio 300 the other week, so i thought i'd setup another CA Cichlid tank.
I found a rocky background at my lfs, which was reduced to clear. I think it had been used as it was quite dirty, still a bargain and nothing a good clean couldn't fix. I like to use the background as a filter, so i drilled two inlet holes on the left hand side and a outlet hole on the right. Two pieces of fine mesh is siliconed behind the inlet holes, this ensures that no fish can get trapped behind the background.