mgamer20o0
Aquarium Advice Addict
iw ould at least switch to a 5 gallon and get 6 neons and be done with it. 2.5 gallon is really a small tank.
Ammonia out of control?? In a pond?? The water would have turned green and eat up all ammonia and nitrites. Is it a new pond?
Anyway, if you want neons, you can add some(they are schooling fish, you'll need at least six which i don't recommend due to the small tank). The biological load might get up quickly if you overfeed.
Did you cycle the tank?
+ you should make some allowance for guppy fry(maybe invest in another small tank)