Originally Posted by KantGetRite
I looked on igreens and those angels are listed as possible for 20g but people on here say no so I guess my question is why not? Is it a bioload issue that I need to be diligent about water changes etc or is it a swimming space issue?
Ok here we go, first off it is doable (I've done it) but it takes some planning. While they do have large bio loads for a nano, that's not the only concern. In a tank that small they should really be the only open water column swimmer. It should also be added last and be added to a mature tank so that the bio filter has been built up enough to handle it. If your really considering this I would say you need to re home both the clowns and the fire fish and gramma and replace them with a sand bed dweller and a percher type fish ( prawn gobies and a clown goby type fish work best). And limit it to 2-3 fish total.