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fish dying

  1. Zebra Danio Die, but everything else Thrives

    Cyprinids and Atherinids
    I've got a 20 gallon tank, cycled, with all nitrogen levels very low. PH is 7.5 I had a pleco, female beta, 4 livebearers and 7 zebra danios. About 2 weeks ago, my zebra danio's started dying one by one. Every other day I'd find another dead one. The rest of my fish are doing fine, and I have no...
  2. Fish are dropping dead and I don't know why.

    Beginner Freshwater Aquarium
    I have a 29 gallon that crashed a couple of months ago. I had a surviving bristlenose pleco and a cherry shrimp. Since then my tank has remained cycled. I got the tank back up to par and added 3 neon tetras and 2 glowlight tetra two months ago. One glowlight died, I'm assuming it had issues...
  3. my fish are dying!

    Tropical Fish Diseases
    I recently got some Platies and I didn't quarantine (I know- I should have) and 3 of them died within 2 weeks. So I was worried that they had a disease from the store but all of my other fish were ok. But today I found 3 of my serpae tetra dead and 2 of my zebra danios. Now I'm afraid that they...
  4. All plants are dying!

    Beginner Planted Aquarium
    Just this past week we had a MAJOR disaster in our 30 gallon well established tank. My son did a 10 gallon water change as he typically does. He added 10 gallons of water from our faucet (also typical) with added Prime to the containers. Within minutes of adding this water we noticed all of our...
  5. advice about a rather small tank? 6 g

    Beginner Freshwater Aquarium
    I have a 6 gallon tank which I've been using as a betta tank for some time, with only plants (Elodea) as filtration, and no substrate. I've been regularly changing around 50% of the water a week and generally trying to take as much care of it as possible. I've asked about whether it's ok to use...
  6. cloudy water and tropical fish are dying?!? :(

    Beginner Freshwater Aquarium
    Please help! I have a 60L tropical fish tank with 7 fairly large fish(now 5). I recently changed the stones (I have done this before and assumed it would be okay again...) and added a new ornament and plants( I soaked these in the old tank water). I also did a 50%ish water change and cleaned...
  7. New fish keep dying

    Beginner Saltwater Aquariums
    I've had 2 new fish in my aquarium die this month. One a dwarf lionfish and another a sleeper goby. Both were eating, had full color, and appeared totally healthy. I had the lionfish for a little more than a month before it died, the goby only 2 days. I was told by the staff at the store that...