http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=aggressive-penguin-tetras#1 Are penguin tetras aggressive? i’ve read information to the contrary but from watching mine today, the seem to love having a go at each other. they chase each other round the tank! I have neons, black neons and penguin tetras. 8 neons and four of each of the other two... original post: September 25, 2007, 9:36 pm Pyeper 2008-05-04 http://forum.aqua-fish.net/?topic=aggressive-penguin-tetras#2 How large is your aquarium? Please, bear in mind that chasing is not aggression. Community fish usually chase each other, especially Guppies do so. jan 2008-05-04 http://forum.aqua-fish.net/?topic=aggressive-penguin-tetras#3 My tank is 24 inches (2 foot)... Pyeper 2008-05-04