Hi,

IME they are voracious eaters for anything that will fit in their mouths, but I never saw any of mine eat any algae if ever.

If healthy, they should ALWAYS have an appetite. They are stupid like some dogs that will eat till they die........

1. What type of angels, age, size, etc?

2. # of other tankmates? Are they bullied by someone? Angels are good defending fry, but some are easily frightened when not breeding by other fish.
Compared to most cichlids, angels are docile. I have had small Apistos show giant angels the door............

3. Most fish will browse algae looking for food. E.g my Amano shrimp leave plenty of larvae in brush algae. All my fish know it and spend a lot of time browsing it, esp after I 'mow' the lawn.

4. Why were they 'stressed'? How long have you had them?

5. Are you missing any smaller fish that are now in the two fishes' stomach?

6. Could these other 2 have stomach bloat?

7. What are you feeding, when, etc?

Try live blackworms. Brine shrimp are not that nutritious when adults.
Plenty of good prepared foods on the market.....