Aggressive Tetra

[huwg]

I recently purchased 5 neon tetras which are doing fine. I only have a 25 gallon tank and intend only having neon tetras. I did a fishless cycle on the tank first.

Over the last day or two though I have noticed one of the tetras is acting very aggressive to the other tetras. The others are now hiding at the back of the tank, whilst the aggressive one is hanging out near the front. If they venture out he scares them off.

Would putting in another 2 or 3 tetras calm the aggressive fish down. At first they did shoal together.

Any advice much appreciated

[wataugachicken]

more is better - you could have a school of 12 or so with no water quality problems.

without some kind of threat, they won't swim together. fish school up against predators, for safety and to look more intimidating than they are. if they feel safe, they'll just swim around individually. at first they were unsure of their new tank and didn't feel safe.

[Squawkbert]

^ true. My fish are generally scattered. For 2 hourrs after I did a PWC, rescape & added driftwood, everybody schooled. It was neat.