The discus breeding pair are guarding their wrigglers on the PVC pipe. Most strains of discus get darker in color when they are breeding and caring for their fry. The discus fry are attracted to the dark color of their parents. The fry swim towards their parents and start eating an epidermal mucus that the discus pair produce on their sides.
There are lots of wrigglers hanging on the PVC pipe. The discus wrigglers will hang on the PVC pipe for around 3 days before they start free swimming. The discus breeding pair might move them from their original hanging spot to a more secure, private location in the aquarium. The discus pair might even move the wrigglers several times before the fry go free swimming.
They are feeding on the side of their mom. Start feeding baby brine shrimp as soon as the fry are 3 days free swimming. Keep the discus breeding tank as clean as possible while the discus fry are with the breeding pair. A diatom filter, like the System One Diatom Pressure Filter or a Vortex Diatom Filter, is very useful in fine cleaning your discus breeding tank.
The fry swim back and forth between their parents feeding off their sides. It's important to start feeding the discus fry live baby brine shrimp after they have been free swimming for 3 days. At that time, the fry should be large enough to eat the baby brine shrimp. This gives the parents a break from the fry constantly eating the mucous food off of their sides. Supplementing the live baby brine shrimp is very important in large spawns because the fry can actually inflict sores on the sides of their parents. The sores can get infected and might kill the parent. Always monitor your discus breeding pairs when they have large spawns and separate the fry as soon as they are large enough to be on their own.