In that thread the angler was an inch or under and he was "making friends" with the chromis. Everyone said one day he'll turn on his buddy and eat him. Don't know if he has yet...Anyway, anglers can eat fish the same size, if not larger than they are. I doubt a 1" angler would go after a moving chromis. The chromis is likely up top or in the middle and the angler is on the rocks..not very convenient. Looks like live saltwater shrimp is going to be a good source of food. You can try getting him to eat frozen foods in the mean time. Experiment..
“Success is walking from failure to failure with no loss of enthusiasm.”
- Winston Churchill