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Death of gold fish

23 11:10:13

Question

The fish in the right
I have a 15 gallon tank with mainly gold fish in it. It was set up 2 months ago. i month before I added 2 koi fish and 4 angelfish with it. After that my moor has suddenly died one morning. it had changed its colour completely to somewhat faded gold and was not even trying to swim, just floating around and died. I had water changes and applied medicines also according to the dealer. But today i lost another healthy goldfish in the same manner... till yesterday it was fine and i found it dead by today afternoon... its colour has actually faded to white. Please advise

Answer
Hello Amala,

Goldfish require at least 5 gallons of water, apiece to survive.  You have too many fish.

As adults, they will require 30 to 50 gallons to survive, each.

Angelfish require 5 gallons each as juveniles and will require 10 gallons apiece as adults.

It's simple mathematics.  You have a 15 gallon aquarium and therefore you can keep only 3 goldfish or 3 angelfish.  You cannot keep as many fish as you have.  There is no way the water conditions can be healthy for them, if there are that many fish.

This is not meant to hurt your feelings and I'm sure you are very good to your fish, however that is why they are dying.

What happens when we have too many fish?  The water quality is very poor.  Take out some water, put it in a white bowl.  Is the water crystal clear, or can you "see" the water?  If you can "see" the water color against the white, then it's bad news.

My guess is that the ammonia levels are off kilter from overcrowding, and nitrates, even possibly Nitrites, are off the charts.

When this happens, it is impossible for a fish to breathe correctly.  Goldfish will show immediate changes in coloration when ammonia is off the charts, and the ammonia is actually burning their skin and lungs as they breathe.

It's time to rehomesome fish.  

I wanted to add that a juvenile Koi requires 50 gallons of water and as an adult up to 150 gallons each, just to survive...it should be far greater than that, if you are able to provide it.  Koi are pond fish.  Not aquarium fish.

I wish you the best of luck.  Now you can take care of the problem properly by decreasing your fish in your aquarium.  

:)

Renee