mouth rot outbreak

Peatear

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i’ve got a 70 gallon community tank and recently realized about 6 of my red eye tetras have got mouth rot, one seems somewhat severe but the others all seem new
what would be the best treatment? i can’t do salt because it’s a planted tank, and ich x hasn’t helped yet. ik it’s antibiotics but what brand would be the best to help immediately
 
Without pictures it is hard to help. However, I can suggest thst you looking into columnaris aka Flavobacterium columnare. If this is the issue it requires an antibiotic to treat.

Cikunbaris comes in a variety of strains some are quite virulent and will kill fish before symptoms even show up whiles other are milder and will take a while before it will kill fish. It is often called cotton mouth disease because it initially shows up in the mouth of the fish and is easily mistaken for a fungal infection. It is also called saddleback disease as it can appear initially as a white patch at the base of the dorsal fin of fish.

If this is what you determine to be the problem,then it is important to treat the entire tank as it is contagious.
 
Without pictures it is hard to help. However, I can suggest thst you looking into columnaris aka Flavobacterium columnare. If this is the issue it requires an antibiotic to treat.

Cikunbaris comes in a variety of strains some are quite virulent and will kill fish before symptoms even show up whiles other are milder and will take a while before it will kill fish. It is often called cotton mouth disease because it initially shows up in the mouth of the fish and is easily mistaken for a fungal infection. It is also called saddleback disease as it can appear initially as a white patch at the base of the dorsal fin of fish.

If this is what you determine to be the problem,then it is important to treat the entire tank as it is contagious.
sorry for the low quality pictures as my camera doesn’t like to focus on the fish, but this is one of the newer cases. i don’t think it’s columnaris but i could be wrong. if it is, whats the best treatment for it?
 

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Have they been fighting?
at night i see them kinda chase each other but i don’t think so. this one (again sorry for the bad quality) seems to be the worst, some of its nose has turned black but the white has cleared up a little after using ich x. it made me think it was mouth rot, but is there a chance it’s simply them fighting?
 

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The resolution is not great enough for me to enlarge the picture to where I can see what you see clearly. But, from your pics unenlarged, I did not see much evidence of "cotton mouth." However, this link may help you to see what mouth fungus being columnaris looks like on tetras and then other small fish Google included in the search results even though . I had ti eliminate pictures of neon tetras which were most what a more basic search yielded.

I Initially did the search asking for "tetra with mouth fungus from columnaris" I had to add "-neon" to that to stop the returns from being dominated by neon many of which showed actual fungus and not columnaris.
tetra with mouth fungus from columnaris -neon
 
Ich X is an antiparasitic that will do nothing to bother a bacterial infection. So what you are seeing isn't connected to the med.

I would go with 25-30% weekly partial water changes, and simply monitor. I've seen a thing on neons that eats their snout away, but it doesn't spread to other individual fish. Columnaris/flavibacter hits that area. So does temporary scarring if males are mouth wrestling/fighting, or if the fish panic and wallop the glass walls at full speed.
 

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