HELP mysterious red rash killing all my fish
55g- I woke up and 3 of my fish were stiff at the bottom with a red veiny rash. It looked like they had been scuffing rocks as well.
Hours later I notice all of my fish starting to shimmy and scrape up on the rocks. The fish stores are closed I have a feeling all of my fish will be gone tomorrow. PH is high and good. Nitrites Nitrates Ammonia low. the water quality is great my fish have all looked healthy a couple days ago. could this be flukes, parasites, bacteria? Theres no visible fungus or worms attached to any of them. It appears as if they are bleeding internally on the bad fish.
I did a heavy water change, raised the temp to 82 and added 10-15 teaspoons of aquarium salt.