Talisman
Fish Crazy

I have a platie that has started to look a bit unhappy (weird isnt it, you just know there not right) on closer inspection it doesnt seem to be using one of its fins to swim with very much at all, hardy ever for the last day ive noticed. But it can move it, just seems not to want to, where its mates use both of them all the time.
Is this what u call clamped fin?? and if so what is the treatment???
Thanks