Curly Antennas on one mystery snail

[Candace]

I actually thought one of my mystery snails was dead because it was on it's back slightly hanging out for 2 days, the snails are about 5 months old. When I went to remove it, it finally closed its shell fully so I put it right side up with some food in front of it. Finally came out of it's shell and actually climbed up to the top of the tank but the antenna's are odd. Sort of curled and hanging limp... I've never had any of my snails do this before and I've had mystery snails on and off since 2019. Just curious if it might be illness, the water or just general weakness from being stuck on it's back for a couple of days? **I am also doing a water change tomorrow, I missed last weeks water change due to an injury and I couldn't lift the buckets.**

Parameters:
Ammonia - .25ppm
Nitrate - 10-20ppm
Nitrite - 0-.25ppm (sort of in-between the colors?)

Temperature: 78.8-79.8 (varies depending on office temp. - The temperature does not seem to be affecting anyone negatively, but I do have an emergency 10 gallon set at 78 just in case)

Age of the tank: About 3 months (cycled first)

Inhabitants:
1 - Blue Ram
14 - Neon Tetras
3 - Endlers
5 - Guppies
4 - Mystery Snails
2 - Nerite Snails
(Plants: Vallisneria, dwarf water letuce, duckweed, red tiger lotus. - Mopani driftwood)

 

[Candace]

Bumping for responses.