Angels Making Noise Bubbles?

[Coltrane9]

Is it normal for Angels to go to the top, and basically take a bit of air?
They'll go to the top, spin around, and take a little bit of the air, making this "Pop" noise from the water splashing.

They do it all day...
It's not a problem at all, but it's surprisingly loud. The water parameters are fine, maybe that's just what they do for fun?

 

[tarpon]

Mine only do this when they're eating. Or I'm just about to lower the food into the water and my hands hovering above it.

 

[Coltrane9]

Maybe they're hungry, but I'm feeding them twice a day, flake food.
They eat it, and then let a lot of it just float around and the other fish get it.

So it seems like they're fed...

 

[tarpon]

I only add a tiny bit at a time and then when that's finished add a little more so there's no leftovers. Its probly not a problem tho.