It is a blood fin tetra, there is a second blood fin tetra with the same issue. But the second one has less damage. I checked the water - ph 7.6 Ammonia 0-0.25, Nitrite 0, Nitrate 0. I do have pressure CO2.
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I can't imagine bloodfins eating each other's faces.I have noticed that my blood fins have been chasing each other for over a week...
The good bacteria we use to deal with waste does require O2 to live and the more O2, the more bacteria, so in a second hand way the low may result in less good bacteria. One of the reasons we find filters good is that it does assure a steady flow of oxygen rich water.Taking that into consideration, I have noticed that my FX4 out flow wasn't flowing as it should. I replaced two round filters and now the outflow is working properly. Could the lack of water flow cause an increase to disease?