the bubble is to help it breathe
Neon Tetra is one of the natural food for the angelfish in the wild. Although, most fish will eat anything that can fit into their mouth.
I would do a water change. What it seems like to me is the fish has a blister or abscess forming on its mouth/lip. This is usually caused by poor water conditions.
A bubble eyed gold fish is a fish
needle fish will certainly not work well with neon's, they will murder the neon's
gulp* bubble* bubble*
Yes, a bubble wall can overpower some fish.
spit
They bubble because if they didn't they would die.
There are multitudes of neon fish, so this question is too vague to answer.
a neon tetra is a fish. It has all sorts of neon colours on its body!
The singular possessive noun for the mouth of a fish is fish's mouth.
Neon fish typically grow to be around 1 to 1.5 inches in size.