The 1st meal is fed as normal. Wait a few minutes after they have completely swallowed the feeder or after you see them adjust their jaw. Then you offer the 2nd feeder.
I wait between 15-30 minutes between feedings when I double feed. It's not a hard and fast rule, just what works for me and I do other things between feedings so I'm not hovering over him.
Sent from my SM-G900V using Tapatalk