Who Gives A Fish Forums

Red Sea Coral Pro is solid, but you might need to dose magnesium separately. I had to when I was using it. What's your dosing routine like?

If the betta starts going after the shrimp, try adding more plants. The more hiding spots, the better. Java Moss is great for that.

Rotala can be tricky without CO2, but it's not impossible. Have you considered adding a DIY CO2 setup? It's cheap and can make a big difference.

I think you should try doing a water change and make sure you've got a heater in there. Doing a 25% water change might help, and get rid of any leftover food that's floating around, it's just gonna cause more problems if it's not eaten.