You don't make them a nest. The male will blow his own bubbles, and that's only to store eggs in. Although if he's not good at it, floating a leaf or the rim of a styrofoam cup on the surface will help him anchor the first bubbles.
A very good use for Fish Bowls is to use them as a vase. They should never be used to keep a fish in. They are far too small.
A minimal tank size of 2.5 gallons is recommended for a single Betta fish.
No. Charcoal bits will harm your betta fish. But you can use deactivated charcoal bits
Yes
Some people do not believe it but the best water to use in your betta fish tank is tap water. Bottled and distilled water has been "purified" and does not have the minerals that your Betta fish needs. If your tap water is so bad that you do not even drink it, than use spring water.
Betta fish live in rice paddies in places like Thailand. These paddies are miles long but shallow without much current. So the betta fish slowly developed the labyrinth organ which allows the fish to breathe air from the surface rather then use its gills.
Betta Fish are carnivores and should not be fed veggies. They should eat pellets made specifically for them. (I use Betta Bites). Also never feed them flakes! Their upturned mouths make it hard to eat them. Also onece in a while you can treed them to freeze-dried blood worms!
Use a ruler and check every month
The Betta fish runs away when facing another Betta because its the first time facing another one. Or its just scared of it and doesn't want to fight since its not use to it and its a FIGHTING fish. But once its use to it the other Betta they well start getting up close to each other face to face and start ripping out each others fins out and basically trying to kill each other chasing each other around.
I would definitely not do this. The chemicals from the paint can be extremely toxic to the fish and can possibly be fatal. If you want your betta to stay healthy, do not use paint in their tank!
you posibily could but i wouldn't suggest it.
Beta fish just go to the bathroom like we do just in their thank or bowl.