Hello I am brand new to this forum and semi new to owning betta's in general.
I have a 10 gallon sorority tank with 3 crowntail females in it with a couple little otocinclus. One of them was doing fine until a few hours ago she started hiding and clamping her fins. When she did start swimming it seemed like her cuadal fin doesn't move at all and its discolored. It doesn't look like cotton to me but it could still be a fungus I'm not sure. They have been doing the usual chasing each other and flaring to establish their hierarchy for the past few weeks but I thought they had finally finished so I'm not sure if this little girl is injured from one of the others or not. What should I do? I have her quarantined at the moment :(