depends what your doing with the previous babies and how many breeding fish u have in the tank elaborate please mr.scott
basically a breeding program fore my red eared sliders to be fed a healthy fish rather then a fatty feeder
I started with 12 mollies and platies currently have 30 fry maturing in my tank
An excess of fish will make your turtle sick, I have a yellow bellied slider a cousin to yours almost excatly the same but different markings. I only give fish to mine as a treat and even then they are ignored for a months. Use a high end turtle food and he/she will be happier, and healthier for it. Don't forget some veggies!
I feed pellets, fruit, duck weed (first put in the tank to look good and help water quality but they devour it instantly...) and then lastly fish