The white appeared on her head overnight. I've put her back in the main tank and dosed with marycyn plus. She's eating now with no clamped fins. Readings are 0,010
I feel like she was more stressed in the QT and I was told marycyn plus is ok for display tanks...keeping my fingers crossed.
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Gack! What happened to the furan 2? Was that making no difference at all?
From your description it sounds a bacterial infection. Is that what you are seeing as well? I'm sorry for lots of questions but we seem to be skipping around a bit here with meds. If it is a bacterial infection, then it can easily jump to other fish so I'd put her back in QT.
It doesn't look fungal to me, what about to you? I've put notes below. I raise this because if it is fungal then neither of those meds will help.
Fungal infections ime progress to cover the fish from entry point. The fungus doesn't jump to other parts of the fish (it just spreads). If the fins are touching a fungal infection on the body then it can spread to the fins even though the fins may look otherwise fine.
Only one fish at a time tends to be infected whereas bacterial can be multiple with quick deaths.
Fungus is furry or fuzzy above the fish scales (although may be more like a white mold skin in early or retreating stages). In progressed stages, tank debris can get trapped in it.
One other question is was the fish flashing around the gills before it started at all? If yes, it may indicate there were gill parasites and the bacterial infection is secondary to that.
Has your tank temp fluctuated? A temp increase can encourage bacterial infections, a decrease fungal.
Meds - any antibiotic which treats gram positive bacteria tends to knock the nitrifying bacteria population down. Examples are tetracycline or erythromycin.
Furan 2 and I believe marycyn plus should be ok but I need to go check.