So you just set up the tank for the goldfish? That could be why your leucistic died. Goldfish produce a lot of ammonia compared to your typical fish. Then you moved them to an established tank where the water parameters are fine, that could be why they were looking better.
When you transfer fish from the pet store to your house also keep in mind that they may or may not have just been thrown into the tank at the petstore. This is very stressful on a fish and can affect their slime coat that protects them from the outside illnesses. Once there is a break in their slime coat all kinds of illnesses can enter its body. That could be the reason your fish died, however, it could be any number of things. The slimy bubbles could be proteins, that would be an indicator of lack of oxygen. It wouldn't hurt if you added an air stone.

You should remove a dead fish as soon as you realize its dead, but there is a possibility your other fish could get something (or they could not catch anything at all). When I've had a fish die over night, the others would pick at it, and I've not had any other issues with the living fish.

Your goldfish should not be kept in that tropical tank for long. It will stress them out because the temperature is too warm for the coldwater goldfish. Your goldfish tank will need to cycle before it can handle anymore fish. Goldfish are hardy, so I am guessing your one goldfish was just sick when you got it.

Hope this helps.
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Phishie
Site Coordinator

"An ounce of prevention is worth a pound of cure."

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