Betta Babies died!!

#1
well i wasn't really prepared the water was probably atleast 10 inches high and i don't think the babies cna stand that!!!

Well, this morning i noticed all the babies swimmign and flaling to the bottom, third day. The male betta wasn't tkaing care of them anymore!! There was gravel i couldn't find any babies and didn't see any swimming to get air so i pushed the gravel aorudn and i think they all died. No oxygen!! I set a new tnak up with no gravel and water lower, when's the next time i can breed the male and female?

And cna u give me some more hints?