Rasboras Randomly Dying

[DeirdreHoyle]

Hi guys,
A few days ago I found one of my 6 rasboras dead. It was totally out of the blue - none of the rasboras were acting weird or looked sick and the water parameters were fine (0 ammonia/nitrites, low nitrates). I did a big water change and just decided to keep an eye on the tank. Today, I found another one dead! I did another water change but I'm so confused! The parameters are still fine and none of the rasboras look sick at all!

The only thing I can think of is old age but they're like 3 years old....

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[Delapool]

Pretty strange?! Nothing chasing them or anything.

 

[DeirdreHoyle]

Definitely no agression from the other fish, sometimes the rasboras square up with each other but it's not usually that bad. I had a problem with some excess brown algae on my plants a few weeks ago.... I checked and had .25 ammonia but I did a big water change and it stayed 0 after that. Could that be it?

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