Neon Tetras Against Glass?

[XeroTolerance]

Hello, I have recently added 5 neon tetras to my 10 gallon tank. Sometimes they swim around like normal fish but other times I see them "scaling" the glass. They will basically put their heads to the glass and swim up and down. I don't know if this is because they see their reflections and want to swim though the glass lol. All of them physically are good. I see no signs of damage on any of them. It seems like when they are swimming normally they see their reflections and try to school with them.

Any help would be appreciated.

 

[TotallyTropical]

That's pretty normal, though mine never did that. I've seen my other fish do that all of the time though. Maybe they're territorial?

 

[peter212693]

My clown loaches did this for a good few days when I added them. They seem to be normal again now.

 

[PrairieSunflower]

I've had the odd guppy do this as a reaction to a big change, it usually passed after about a day.