My question is about tetras. I have only sad experience with them when I bought a school for my new 80 gal tank (cycled) and they all died out in a matter of two weeks apparently from ich.
My tank population comprises 5 cories, two golden gouramis, 5 cherry barbs, one ancistrus and a group of apple snails.
I love tetras, they would be a nice addition to this tank since it has dark water (from bogwood).
The other day I bought a couple of cardinal tetras. I know, there should be more, it is a schooling fish, but I was afraid of diseases, besides they only had the remaining two for sale. Others where a new arrival and they where on a quarantine. Today I came to purchase some more and when they were already in the bag I noticed that their tiny fins were flared. I bought some neons instead. But when I brought them home I discovered that their fins were also sort of fringed. They looked fine otherwise.
Could it be because of water condition or this is a sign of a disease? I wanted to go there tomorrow and get more cardinals and neons. I only wish to know that they won't disappear in week or so and most of all I am worried about infections. The store's staff isn't helpful with any advice on that.
Has anyone had any experience with those beauties' fins and tails?