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death of mulitple fish

  1. Tropical Fish Diseases
    I have two tanks, a 20 gal, and a 55 gal, I did a 50% water change on the 55 put the conditioners in and everything. Let it sit for a bit to let any chlorine dissapate. And put the fish back in. And keep in mind this is an established tank that's been running a year. I frequently check the water...