Please Help

I have a female in my sorority that is acting strangely but looks completely normal. She rests a lot and can't seem to swim for too long. She acts as if she can't hold her own weight up and she hides/rests in plants. Until a few days ago I hadn't seen her show any interest in the plants.

I just got through with a 10 day salt treatment for ick(on another girl). The ick is gone and all the other fish are fine.

She has been acting like this for maybe two days.

She is in a 10g filtered tank that stays around 78 degrees. I don't have a test kit to test my water. I use water that I age for 2 days. My water changes are normally 50% once a week but lately has been every day 100% to treat for ick. The last water change was done today with no salt in the water.