Ok, so I have a 20 L tank, sand substrate, live plants, a few rock structures.
1 Electric blue Ram
5 Panda Cories
5 Cardinal Tetras
2 Ghost shrimp
After I introduced the EBR, the two smaller pandas died, no visible symptoms. That was probably two weeks ago.
Yesterday I came home from work to find one of my three remaining pandas covered in cottony white stuff and laying on the bottom, but still alive. I ran out to the store and got Mardel Maroxy. I did a water change and dosed the tank. About an hour later the panda was dead. No signs of anything wrong with any of the other fish. Today i came home to find 4 dead cardinals and 2 dead shrimp. While I was netting out these, the other cardinal, who appeared to be fine, went belly up and died shortly thereafter. The EBR and the two remaining cories and snail appear to be fine. Should I continue dosing the maroxy? Any other suggestions?
Nitrates: < 5.0 ppm