A game or aggression ?

[algae]

Are my Neon Tetras just enjoying themselves or what. For what ever reason they seem to be chasing one another more frequently these past few weeks. They are all males and have been with me for over a year so I would have thought any territorial disputes would have been sorted by now. The only other species in the tank are Guppies and they don't tend to mix or show any interest in the Tetras. Psychologically if I was stuck in an enclosed space with time on my hands and had no other option but to chase someone I'd probable do just that, better than just vegetating.

[plankton]

Just keep your eye open for any nipping damage.
I've noticed my emperors and lemons are more active at the moment as well.

[Martinspuddle]

my Neon Tetras are all males

Buy some females will a sure cure to any issues ...I wouldn't want be stuck in the same glass box for a year with the same five blokes.