kaiofcanada
Aquarium Advice FINatic
It could be all four by now. If she had parasites it could lead to a secondary infection and the parasites leave open wounds where they've eaten away at your fishes flesh and an open wound can easily get a fungal infection. That's why I use Seachems Polyguard, it treats all four, the same way. But it can turn things in your tank blue. I've never used it but I hear that Seachems Paraguard works well for all four also. I've never had any luck with Melafix, myself.
At this point I would treat for parasites, bacteria, fungus and open wounds. She's been sick for awhile now.
I agree with above. As I stated before to treat her gently but asap. Melafix is very gentle on your whole tank and plants. That is why I suggested it. You certainly don't have to continue to treat with it if you don't see her getting better within the next 48 hours, but at this point she has been sick for a week. Melafix won't hurt her. But I fear that WendiDell is right about her now having developed secondary infections.
You mentioned a couple days ago that the white looked fuzzy, which was likely a fungus. Yesterday you said it looked more like grains of sand...which screams bacteria, and today you mentioned an open red area behind her fin, suggesting an open sore. Poor baby. I it best to treat her gently, but also to treat her completely.
I know this morning you gave her a salt bath which will help with the open wounds and bacteria. Melafix will address the fungus. And daily water changes will help keep her and all of your other fish in the best possible environment.
Do you have a quarantine tank set up to treat her separate from your tank? This way you don't have to worry about the medications wreaking havoc on your biosystem or plants.
Are your other fish still all looking healthy? If so, you might move her to your QT tank and treat her there. If not, and others are looking sick you will need to treat your whole tank. That is trickier in a planted tank because many medications will either be detrimental to your plants or hard on your BB.