A large enough amount to cover half of the 10 gallon
No it means they are ready to mate and might even have eggs in it if there is a female in the same tank.
No because i have had a male betta in the past and it was just him in the bowl and he was always making bubbles... I guess it just depends if your fish wants to mate he will make bubbles Hope this helps :)
If they are not too old and the female is ready, then they will mate.
the male betta will make bubbles when he his making his nest and when he is ready to settle down and should probably find him a female betta but make sure that she is beautiful so and you should get a etta bow front double tankkit for them and out one on each side wihout the blue divider so that he can get used to her an decide if he likes her and i she likes him and when he starts making those bubbles take out the ther divider so that they can mate
If it is male it more than likely means it is getting ready to mate. If the bubbles are staying on the top the fish is just building a nest for the female to lay the eggs in.
the guy at PetSmart told me it means the fish wants to mate ...yep, even fish have the need :)
Yes
No they can't.
Yes all bettas can mate with other bettas. " regular betta fish" there are different types and they can all breed together.
to make more bettas
It means they are getting ready to MATE
Anabantid bubbles pop naturally. If the temperature of the water is over 80F the bubbles may pop quicker than the fish can repair its nest. That is why the recommended temperature for Bettas is 78F.