Baby with reflux

Hello mummies, sorry for posting poop picture 🙏🙏🙏 my boy turn into 3 M and his reflux got better. So i changed enfamil AR formula to Enfamil A+ last two days. He become more fussy and lesser drink milk. Previously he drink about 700-800ML a day. After I changed formula he drink only 500-600ML a day and his poo also change to watery like picture. I don’t know what to do and should I change back to AR formula. Is it ok to feed AR formula eve though his reflux is better. Pls share and advise me if you have same experience like me 🙏🙏🙏 Thanks in advance…