Sick Corydoras Sterbai

Heavy breathing and not moving. Eating a little... what medication to use?
No another fishes in aquarium only 4 corys is in 60l breeding aquarium. Cicled sponge filter and air stone, temperature 26C,
Changing water daily about 10 liters, to trigger to spawn Bare bottom, and some amazon plants, java, cabomba etc.
Is there posibility of gill flukes, or something ?
What to do?
Maybe a clue?

Thanks!

what are the water stats

ammonia , nitrites , nitrates and ph ?

Hi EraseR

If you put your corys in a tank to spawn, I would like to assume that they are mature and that they appeared healthy and well conditioned to begin with. If so, it's possible that they are only stressed out by their new living conditions. You might want to try adding a little sand to the bottom and stopping the extra water changes.

You cannot force a cory to spawn if it is not ready. If they become distressed by your efforts, it would be best to wait and see what happens when left on their own.

Sterbai is better I think, but sometime have speed breathing and uncontrolled moving gills when not eating ...

Today I put some Sera nitrobacteria for aquarium filters to provide better cycling filter and water. Sponge filter is old and working abuou 6 month in this aquarium, only small cleaning of filter sponge with old aquarium water!

Water parameters PH7.5 Nitrate 20mg/l in city water is 5mg/l. Feeding with spirulina tablets and discus granules by Sera.
This is my tap water and I am breeding Angel fishes for 2 years. Sometimes I mix destilate water only for eggs, for better haching !

How to eliminate posibilliti of gill flukes (parasites) or to stop heavy feeding, because nitrate is too high ?
I will post some new pics of my breeding aquarium in this pic is 2 month old, and this another aquarium with gravel...

Thanks for answers

A nitrate reading of 20 is nothing to worry about. If you are conditioning the corys for breeding, increase the amount of meat in their diet. I prefer to feed mine live blackworms, but frozen bloodworms would work well too.

Are these wild caught corys? Have they been in tanks with fish that have had gill worms? Never medicate for a problem you are not sure your fish have.