I was hoping I could have a kind of natural ecosystem with the axy's and a group of guppies. I thought it would keep the axy's physically and mentally active if they were hunting. But the guppy breeding rate was too low, the fry are not much of a meal and adults are too fast. I have 3 axys in the tank and they never managed to catch an adult guppy. I had 2 big fry and one of those did get chomped. I still have the other big fry and one adult guppy in the tank they have survived for 3 months. I just sold the rest of the guppies in the end as the tank felt too crowded and I was worried about the water quality as the fish seem to poo non stop!