My betta is a beautiful fish in a heavily planted 5 gallon. He’s had fin and mouth rot before but with nitrofurazone he healed within a week. Couple months down the road, I’ve now got a group of 11 cherry shrimp and 3 Amano shrimp and one ghost shrimp. There’s also an Otocinclus catfish and a bumblebee catfish. A couple days ago I noticed a tear in my bettas tail fin all the way to the base of the tail. I wrote it off to his fins getting extremely long, longer than I’ve ever seen a bettas fins before. Enter today, I just got home from work and the bettas fins are all but gone. I’ve never seen fin rot completely devour a bettas fins in a mere few days. Is that possible? I noticed the tanks temp is a bit lower than normal down to 74F instead of 76-78 like it usually is and I haven’t done a water change in ages. All the shrimp are frantically cleaning due to all the algae being consumed.(I had a huge bloom of hair algae recently) Would shrimp attack a betta? Or has fin rot took hold and did that much damage in just a few days?
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