Gill flicking?

[Lachesism]

Hi! Lachesism here. Now, this isn't an urgent question, more like an "I'm curious" sort of thing. I've recently gotten two new juvenile axolotls and I have them set up together. I've got myself one Leucistic and one Wild Type which I believe might be GFP (I bought him as a normal wild type, but he has some eery-looking green eyes). They both have little stub arms, which they've had since I bought them and I think it's pretty cute.Now, the wild type tends to flick his gills a LOT. Maybe once every minute or so, meanwhile, I don't think I've ever seen the Leucistic flick his gills. They both eat fine, and they seem to always be buddy-buddy with eachother and stay close, but I'm just wondering why one flicks his gills like there's no tomorrow and the other... Well, he just doesn't.

 

[tipnatee]

In my experience flicking gills behavior mostly just catching oxygen in water, wild type doing more than leucistic ? Well, I used to wonder about the same thing. My leucistic gill seems to be lighter softer but my wild gills seems to be thicker and bushier. Wild type seem to react more aggressive than leucistic when it comes to environment. Do you add enough oxygen in tank?