I'd say body type is like a leech, but not a def there's alot of species of leeches belive it or not. I don't know what exact kind, never seen them as pink in color. I'd take them out check your fish & remainder of the tank ect. good sweep. Put your checked fish in a holding tank. If it is a leech get some raw meat room temp with lots of blood soaking out from it on an old plate or desposible one. When & if it get's hungry if it is a leech, it's body will swell as in full then that's it. They only eat till they are full then fall off. Other than that clueless