No, gravel covering the ground of the tank or bowl will do fine. If you can fit them, they might also like an aquarium plant (living or plastic).
the male betta fish makes the nest.
they can. but it is VERY rare. usually you would see a bubble nest.
The male Betta builds a bubble nest at the surface of the water. The ova(eggs) are fertilised under the nest then collected by the male in his mouth as they sink. He then places them in the nest where he tends them.
Just leave it. If you really want to remove it you can, but it's just a sign of a healthy betta.
There is no need to remove them. The fish is building his nest and is ready to breed he will only make more.
Check this link and I . Basically, it just looks like a load of spit floating in the water (it is, but betta spit.) Some bettas are mouthbrooders, meaning they incubate their eggs in their mouths, like the popular Betta Pugnax.Happy Fishkeeping!I found this link very helpful: http://www.bettatalk.com/how_bettas_spawn.htmAnswer-It is a whole bunch of bubbles at the top of the water. My Betta made a huge bubble nest.
the Betta or Siamese fighting fish
http://www.firsttankguide.net/betta.php
The male will make a bubble nest when the female is about to lay her eggs.
Place a female in close proximity where he can see her.
It's not something on the fish. He will blow a nest of bubbles on the surface of the water that hold up the eggs.
Betta fish reproduce through a process called spawning. The male builds a bubble nest at the water's surface, then courtship and mating take place. The female releases eggs, which the male fertilizes, and he collects them in the bubble nest to protect them until they hatch.