cardinal tetra

My German blue ram is extremely bloated and has lost all coloration. He never moves or eats now. He started acting like this when I introduced him to a new tank with 13 cardinals (who also don’t eat). As of one week later, 9 cardinals have now died off. I am thinking that it might be an internal...

I have 10 cardinal tetras and a German blue ram in a 20 gallon long that’s heavily planted. I added the tetras last week and I added the ram a few days ago. I lost two cardinal tetras today. On top of this, no one will eat. The cardinals have barley been eating at all this week but now they...

I am pumped to say I recently got 12 cardinal tetras for my 20 gallon long. I was planning on feeding them a diet of mainly freeze dried blood worms. Is this okay?