Do Fishes go to Heaven???

Today marks another sad day where all my Cardinal Tetras died ....all five of them to be exact!! It seems that the salt and Tetracycline couldn't save them.

It all began in early this morning where I spotted one of them swimming upside down. An hour later, it died. This trend occurred throughout the day until all of them died by evening.

Now, I just have two Glolite Tetras surviving. Don't know if they will get infected but so far, they have yet to get this infection. I really hope that they will SURVIVE. I will give them abt a week before getting new fishes as I'm not gonna give up rearing fishes and give it another try.