Question about corydoras

[PJ_fishkeeper]

I have some green corydoras and 3 out of 4 of them seem to have this protruding part in their upper frontal chest area. I attached 2 pictures of it.
I was wondering if anyone else has encountered this before or knows anything about it.

 

[SaraB]

They look like they are just fat. How much are you feeding them?
Just in case, what are your water parameters/water change schedule?

 

[Leeatl]

They look like they are just fat. How much are you feeding them?
Just in case, what are your water parameters/water change schedule?

I agree . If water is ok then cut way back on feeding for a while and see what happens . I only feed my Corys every other day , but they do get some from what the other fishes miss .

 

[PJ_fishkeeper]

They look like they are just fat. How much are you feeding them?
Just in case, what are your water parameters/water change schedule?

Ya I think their fat I put in one shrimp pellet for each Cory and khuli loach once every day.
The water parameters are fine I'm doing an almond leaf treatment for some of my fish in the tank so it's tannin tinting some of the water and also the Cory's are in a orange see through tube.

 

[King Fisher]

You could try fasting them for a few days if you think they're constipated.