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Help! My fish are dying

Subject: Help! My fish are dying
by RAirey on 28/9/2020 11:19:58

Hi, I've had an aquarium for 4/5 years now, but have a sudden issue with my fish.

We have/had 2 orandas, 6 amano shrimp in a 62l aquarium with a CF2 filter and an air stone.

Earlier this year in the hot weather we lost a fish to swim bladder problem, and 3 weeks ago we bought a new one to replace it. Each daughter has a fish each which they name, and love.

earlier this week i noticed they were both off their food. I tested the water - all fine, did my usual water change at the end of the week. Things worsened at the weekend with them both being lethargic. during a brief swimming stint i noticed that the bigger fish's tail was shredded at the end, so i headed down to Pets Corner and grabbed some fin rot treatment which went in Saturday evening.

Rather than getting any better, the bigger fish died last night, and the baby looks like it'll join sometime today. I have taken it out of the main tank into a quarantine aquarium as i saw one of the shrimp go for it, so I figured it was probably going to die anyway, at least it should do it in peace.

I have no idea what the issue is - can anyone shed any light? the water is fine, i've tested again this morning and all is within the green areas on the charts. Are the shrimp killing my fish?! I already have one very distraught daughter, and likely to have the other one the same after school today.