Yes, I do stir the gravel before doing water changes. Thank you.

Hi and welcome to the forum,

The problem here is probably a phyisical one with bacterial secondary infection. There are a couple of questions I need to ask, first what type of gravel are you using, do the grains look like small pebbles or are they more irregular shaped like chippings? the other ...

Hello, I just read the sticky about Cory health related questions and I'll include as much info as I have.

The temp is 76*
pH - normal (sorry... not sure of the range, I did a test last night and it was in the normal range)
gh - ?
kh - ?

I clean the aquarium every 2 weeks, changing about 1/4 of ...