I'm thinkin of gettin dwarf puffer fish, for a 15-20 gallon aquarium (56-75 liters). I dont think ill b able to keep frozen food in the fridge, so that leaves live food. Ive researched pond snails, could i use that as the main diet for puffer fish, or would i have to use another live food? I would rele like to have something i could keep in my old 2.5 gallon aquarium, which has a small filter. Any sugestions would b apreciated