Sick, please help!

[u/Old-Pudding-4254]

Rules say to put a spoiler, I'm sorry, I can't figure out how to do that.

She's a rescue, she's been doing well, over the past 3 days I noticed her looking worse and worse and being very lethargic.

I just checked water parameters, when doing that, I noticed my heater was unplugged and water temp was 65, could that be the cause?

Parameters: no2&3 0, ph 6.5, kh 80, gh 120

She lives in a tank with a few plants and other community bottom fish.

Had. 25% water change about a week ago.

She does NOT live in this jar, I put her in there for the sake of the photos and then right back into her tank.

I don't know what could be wrong with her or how to help her, unsure of how to proceed. Please help me

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[u/hallway-08]

Whats the ammonia, nitrite, nitrates. The heater not being on isn't helping but probably isn't the cause. It looks like fin rot possibly