Glow light Tetras chasing one another?

This is some what normal for tetra one will be the head honcho the dominate one I would be worried if it continued after a week or 2 I'd put some stress zyme and coat in the water with a small amount of aqquarium salt and keep the tank dark for a day or 2 it will calm them down a little

How big is your tank and how many glolights of which type do you have?

The danio glow lights can handle being in a 20 gallon tank in a proper group just fine, the thicker-bodied larger tetras need a 25-30 gallon tank. Now...tetras are picky things and many types do nip, same with a few danios, especially the tinkered glolight ones, they loooove being in their schools, and NEED a proper group of 5+, but for every group of five you need several gallons worth of space. Six in a twenty gallon, perfect. Especially if you have a lot of hiding places and such. If you do not have a proper school, or the proper space, they will fight. Fight for space, fight because they're stressed and insecure outside a proper school. And on occasion...you just get what I like to call a jerkfish, who is uncommonly aggressive for it's species no matter what the space and numbers and proper everything...those need to be removed and replaced or they will kill everyone. Jerkfish will kill whoever they feel like killing at the time, it's extremely uncommon aggression for its type and there's not really a cure, it's like a rabid fish with a fried brain. Like I said, those are uncommon and so is that type of aggression. If everything else is perfectly in order, water parameters, space and schools, you may have yourself one who needs to go. In all my years of keeping, breeding and raising fish, I've only had two jerkfish who would relentlessly kill off everyone else, and it doesn't always start that way, it can happen later on. Tried everything to get them to behave that you could try with dominant fish, nadda, best to take them to a shop and exchange.