well the guppy pair is probaly meaner since guppies need trios. well 8 gallons is better, but dont be suprised if you find a dead fish, there so agressive, i must emphasize that.guppy2002 said:i have never seen mine chase each other at all. well, the male chases the females sometimes, obviously. my guppy pair is meaner to each other than my mosquito fish.
also, i made a mistake, the tank is 8g not 5g