Here are some clearer images. It’s fin rot isn’t it
reddit.com/gallery/m796sp
reddit.comPosted Mar 17, 2021, 8:00 PM UTC
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reddit.comI'll bet nipping. Tiger barbs are little buttholes. Lol
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Ammonia 0, nitrite 0, nitrate≈20, temp 26C/79F, 55 gallon, 9 tigers, 3 sae, 1 krib, 1 bristlenose pleco, 3 zebra nerite snails
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it looks more abrupt. like nipping or trauma to the fin?
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Cpuld be nipping. Monitor their behaviour