I have a separate tank that I want to use for breeding. Last week, I had my gourami breeding pair in there. But, then, my angelfish laid eggs on my glass cleaner, so I took the gouramis out and put the angelfish eggs in. The temperature is around 27 Celsius. The eggs all turned grey and none hatched.
But now, I see these other critters on all the surfaces.
I think they may be daphnia, water fleas. But I'm not sure, having never seen them before. So I'm looking for verification, or information on what they actually are.
Also, could these critters have caused the failure of the angel eggs hatching?
Do I need to get rid of these before I try to breed the gouramis again, or are they a good source of food for the breeding gouramis and their fry?
It looks like they could also be ostracod, copepod, or amphipod. It would help if I could get a better view of them!
I've been dosing the tank with yeast, as per fedding Daphnia. The critters seem to be doing well. They're not getting bigger, but they're active. After adding yeast the water clears up in two to three days. It's still not a certainty, though.