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Old 03-05-2017, 11:01 AM   #1
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neon tetra fungal outbreak

Hey everyone, I just transferred my neon tetras to a bigger tank (20g to a 40g) and most of them are now suffering from fungal infections (or at least what I think are fungal infections; white cottony extensions on different parts of fish).

I previously had them in a tank with dalmation mollies who suffered from this when i first moved them into the tank from the store. I treated with tetra lifeguard tablets and it was gone within a week. I moved the mollies that previously shared their 20g into the 40 gallon a week before and they didn't have a fungal outbreak.

when I was looking online about it, many places say fungal outbreaks can be caused by stress, dirty water, and/or weakened immune systems. Which would make sense that they would be stressed after a big move to a different environment.
a couple of people said that fungus will always remain in the body of the fish but will break out/become active when stressed or when immune system is compromised/weakened. I just wanted to see what y'all thought about this?

If this is true should i just wait for the fish's natural immune response to improve in their new environment? It already seems like on a couple of fish the cottony parts are getting smaller, but for the majority of the fish the sites are not shrinking or growing.

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Old 03-07-2017, 08:46 PM   #2
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I'd agree the fungus and bacteria and maybe even parasites are always there in say the water but a healthy fish can cope fine. Any stress or a bit of damage and they take advantage very quickly.
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Old 03-08-2017, 08:42 PM   #3
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It's true that the underlying cause is always in the tank and an infection is caused by weakness/stress

Although I will say that this is not one they just get over. While not life-threatening, the lumps will come and go, causing the fish to always be slightly weakened

Any new fish will also be affected

I have been dealing with this since January and used Lifeguard and an anti biotic before finally figuring out that it's fungal

There was even a period where the lfs said it was viral and I should do nothing, so now my new harlequins have it too.

I would treat and save the headache
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fungal, neon, neon tetra, outbreak, tetra

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