Well, right now in my tank, I have the following:
2 dwarf frogs (although right now I can only find 1)
1 clown loach (he's small, I trade in when he gets bigger)
1 pleco (same as the loach)
1 cardinal tetra (long story)
5 neon tetras
3 sissortail tetras
7 cory's
1 platy
This is a 29 gallon tank, and a lot of people would probably say the tank is ALREADY overstocked. Thought of moving maybe 2 of the cory's and the platy to another tank, but not sure. I like the fish in it, and wouldn't mind adding a few more possibly, like some serpae or red eye tetras. Maybe a black/red tipped shark(don't remember the name of these), or possibly something else, I don't know. Just like having the option. Just how much of overstocking is ok? Also, as long as your tank is healthy, and the fish are added slowly, along w/weekly water changes, what's the hard thing about it?