nice fishes there, but two suggestions also from Heiko Bleher:
1. Some of your Blue (S. haraldi) have also "bones" sticking out and have to be fed very well, variated foods and several time a day. (Good you have saned, and you can see how they search already in it, as in nature...everyone should do that).
2. I would place the Heckel Discus (S. discus) separate, not together with the Blue discus, there are several reason I explained well in my book and also on the Website of www.discuspassion.net under Heiko Bleher - Lessons.
All the best, and again nice fishes, which need now still lot of attentions and care and than you will be rewarded.