roadmaster
Fishaholic
As said above, pigeon and red turq. I'd suggest taking out the Angels if they are getting aggressive, and also keep a close eye that the S.A.Es are not eating the slime coat off the sides of the Discus. Not all Discus will show stress bars, Pigeons for example will show "peppering" (tiny black dots) all over their body instead.
You will have to ween the fish onto other foods, it will be much better for them in the long run. There are are a few methods to get them onto other foods, the least stressful being feeding them Tetra prima (and the foods they don't like) first thing in the morning when they are most hungry. If they don't eat then you can feed them what they do like (blood worms in your case.) If this method doesn't work, mix tetra prima into a dish with a little bit of water and blood worms. Let them soak together and then feed. Start with a small ratio of prima to blood worms, and slowly up the amount until they are taking plain tetra prima readily.
If that method doesn't work, you will have to fast them for 24-48hrs, and then feed the food.
Adding Garlic Guard can help too, as this will increase palatibilty in the foods.
I agree with above, My own fish were much hungrier of an evening but it is of little matter. Is as Conner said, Important to try a variety of foods and I have found that a turkey baster can be helpful in removing foods from the bottom if needed.
Would offer new foods before water change time if possible. Would as you have done,,remove competition for foods with fish such as Angelfish. Would give the new discus perhaps an hour after feeding to forage at their liesure. After that, I would remove any uneaten food.
Also agrere that RT will always have stress bars evident but at times of excitement such as feeding time,or during times of stress due to possible aggression from other discus,water quality issues,or while exhibiting dominance behaivor,the bars will be more defined.
Sounds and looks like you have some very nice fish. Their continued development,will rest with your husbandry and clean water.