I have a 10 gallon tank with a betta, 3 hatchet fish and 1 adf (1 died cause it had a disease from the store in the second week :C)
My betta doesn't mind the hatchet fish, he doesn't even chase them around, just avoids them. The hatchet's stick together in the middle or top of the tank. Sometimes closer to the bottom, but they are supposed to swim at the top... So if I were to get a few more would it make a difference? How many should I get, also I have a great filter and the water levels have been good for 2 weeks.