The one thats doing is it about 13cm, there is another 13cm in there but i have have them for years and they have never bred. Once i had a blue one and they bred, but ghost knife at the eggs, and then the blue one died for some reason. Was a few years back. The other 3 aren't breeding age yet. So im pretty confident they aren't breeding.
"the shakes" = she(?) was shaking her dorsal fin like crazy, very small fast movements.
Now she at it again. parasite maybe? now shes shaking her bottom fin and use her... anal fins? as if shes trying to scrap something off. shes swimming at funny angles as well. looks really distressed, darting around the tank and rubbing herself anything she can find.