I bought 2 platies from walmart two weeks ago. (I know you're not supposed to buy from walmart, but she was pregnant and looked about ready to pop when I was buying filter cartridges, so I couldn't leave her.) I have a male, Luigi, and a female, Peach. I had a third, but when she dropped her fry she died

Peach and Luigi are in a 14 gallon tank with my male
betta, Jaws. Jaws LOVES them. He swims with them, (or at least tries to, but he is way too slow) and builds bubble nests in the tank, even though the filter sucks them in. Anyways, I want to protect Peach's fry, but I no money so I can't buy a smaller tank for her. I've tried a breeding net before with my third and now dead platy, but she got really stressedt so I let her out. I already put a net over the filter so the babies won't be sucked up, and I added a rock formation that has a cave in it, but the entrance is tiny. Are there any more ways I can protect Peach's fry

If needed, I can move Jaws into a 1 gallon fishbowl until the fry are big, but he loves all the space to swim and has just recovered from a long battle with fin rot


Is Jaws (the betta) going to be fast enough to catch the fry, or are the two platies going to be the only predetors?? Thanks in advance.