I've used methylen blue only once when I tried to hatch some Corydoras eggs as a newbeginner. They just dissolved, and none hatched. And later on I've not been very happy about the idea of small fry hatching in medicated water. That's not healthy for them, I think.

Later over the years I've been ...

Thank you both

I'm posting this for someone else. She bought this catfish in a store where they just told her it's name was "pleco".
I don't know what it is, but guessed Gibbiceps.... but it might be something totally different. What about P. pardalis?

Anyone who knows and can help id this "pleco" and give a sp ...

Isn't much in this hobby that are cuter than Corydoras babies