I was thinking possibly Rust but colummarus is a good candidate as wellFishGirl38 said:Hi, welcome to fishlore! I would say your nitrates are a bit on the higher side, and should be lowered. But it's not very likely that those are contributing to the illness. To me, it looks like some type of bacterial infection. Not sure from there what kind or how to treat though. It could be columnarus considering how it's spreading but, that's a bit of a guess.
Yes, nitrates are 30. I thought anything under 40 was good? I never add the water from the pet store (only what accidentally comes off the net when transferring). The other fish died within 24-36hrs. Thanks for the reply!Fishdad85 said:Is your nitrates 30ppm? If it is I'd do a water change. How long after did the 5 die? Did you add the bag water to your tank or fish them out and put them in your tank?
Make sure you add aquarium salt and not table salt,Thelasttankonearth said:I would perform a water change. Then add salt. 1 tablespoon for every 3 gallons of water. I would also consider using erythromycin. Just my two cents.