Crowding and fungus/leaf spots on mint?

[ladrianmarie]

I overwatered my mints early on and they got yellow spots on some of the leaves. I've been removing the spotty ones and thinning the stems out a bit for airflow, but it hasn't resolved. Part of the soil also had some white powder on it, not like mold but like little granules. They should have more air and space now, but I wanted to ask for tips. They're growing lots of new little leaves close together, not just lanky stems, so I think they're happy with the amount of light and growing well, they're just not drying out properly. Does this fungus need to be killed, or will drier conditions get rid of it? It's not too severe yet.
Adding: for reference they're a few little plants in a large pot indoors.

 

[oneeye]

Hold back your water if you have small plants in a large container. Let the plants dry out for a while and see if that helps.