Yes, but it stains everything so it is best to treat with methylene blue in a separate tank. Move the eggs to do so. If you have a spawning cone, the discus will lay their eggs on it and that makes moving the eggs easy.
I have not had discus but with angels I move the eggs and treat the eggs in a separate tank and leave them there. I have not thought about just dipping them in antifungal and putting them back with the parents. I guess that could/should work. You might dip them until the eggs get a bit of a blue tinge. But usually when you leave the eggs with the parents, they tend the eggs and you really do not need to add antifungal. It is only when you remove th eggs that you need to use an antifungal.
methylene blue?
Yes, but it stains everything so it is best to treat with methylene blue in a separate tank. Move the eggs to do so. If you have a spawning cone, the discus will lay their eggs on it and that makes moving the eggs easy.
they are of a piece of slate. So dip them in that and put them back in the tank with the parents?
I have not had discus but with angels I move the eggs and treat the eggs in a separate tank and leave them there. I have not thought about just dipping them in antifungal and putting them back with the parents. I guess that could/should work. You might dip them until the eggs get a bit of a blue tinge. But usually when you leave the eggs with the parents, they tend the eggs and you really do not need to add antifungal. It is only when you remove th eggs that you need to use an antifungal.