Pictures, please! Red gills sound like gill flukes maybe, or bad parameters. While the flashing either means bad parameters or internal or external parasites. I don't think internal parasites would work that fast and external parasites would probably be fairly obvious so I think it's probably...
probably wouldn't even realize it's alone. I moved my two mystery snails from my 5 gallon to my 20 gallon and I don't think they've realized they have more space.
All overstocking does is forces you to do more water changes and change a higher percentage of water. Leaving the cory cat in the stressful situation of being alone isn't worth it, you should either rehome the cory cat or get a few more and change the water more frequently or change a higher...
If there are males in the tank she is probably pregnant. She doesn't look super pregnant if she even is. They are usually pregnant for about 1 month before giving birth.
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