Marks on bottom of Cory

bcsay720

Hello! I've got a school of 7 peppered cories (with two babies that I raised from eggs being moved to the main tank next week). My favorite of the bunch, who is lovingly named "Fat Lady," has developed some marks on her stomach that are seemingly internal over the last two days. She's always had a red mark by her tail that looks like a vein that I was told months ago on here is normal and fine, so this could be similar. She seems to be getting bulkier around the middle, so it could be that she's got eggs, but I just want to double check.

29g planted tank, running since March (upgrade from 10g tank, so the media is 11 months old)
Water changes once a week with Prime

Ammonia: 0
Nitrite: 0
Nitrate: 5
pH: 7.2

Fish: 7 cories, 2 honey gouramis, 7 glowlight tetras, 1 nerite, 1 ghost shrimp, bladder snails

No behavioral changes. She's her usual happy self.
 

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