Fin Rot

[d3tained]

Hello all!

I got 35 Cardinals that i bought from n good supplier yesterday.Now some of them have started to show like white stripes on edges of the fins.Looks liek the fins have been painted with white paint?

Do you guys know a good fix for this?My water quality is good.Nitrite, Ammonia, Nitrate all in range.Planted tank.30% water change every 3 days.

Any help please?

 

[WILDER]

I would try a bacterial med for now.
Increase aeration as meds take 02 out of the water.