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Hi all,
I carefully inspected my fishes after almost after a week, and I found most of my neon tetras, and few of rummynoses are affected from fin rot. Fin rotting is only for these two species. Moderatley bigger fishes like danios are healthy. These two species are smallest in the tank. Though I have not seen Ragging/nipping by other fishes.
I have other fishes in tank including rosy barbs, widow tetras, sucker fishes, zebra danios. Recently I introduced two Macrobrachium sp.

I am not sure, what is the reason behind it.

Please help.

Fin rot generally result due to bad water quality. When was the tank setup, how often do you change water in your tank?

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Macrobrachium sp. could be culprit too

sushant wrote:Fin rot generally result due to bad water quality. When was the tank setup, how often do you change water in your tank?

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Tank is 6 month old. Running powerful filteration from canister filter. Water temp is around 25-26 degree Celsius.
I do 50% water change weekly.


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saikumar wrote:Macrobrachium sp. could be culprit too

I am guessing in the similar way, because only after introducing those shripms (accidently instead of amano), my neons are being affected.

Any more experience sharing from the senior members would be appreciated.

I guess Saikumar is right, the fish in pic ( was unable to see it yesterday) looks like it's been nipped.

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Update: Removed the culprit shrimps.. All tetras got their fin back