I have a 30 high aquarium, without a sump (thats a future project, maybe). I got the tank already established from someone else, but it was neglected for a while with an eel in it, so the nitrates from that were probably high. I have had it myself for about 4 months. I don't think the water was changed in over a year before I got it.
It has 2 clowns, a goby, 3 snails, 4 hermits, 5 nassarius, 2 bta's.
Is a sump something that can be added without cutting/drilling/slicing/gouging?