I actually have this little crabs in my aquarium in Florida (i caught them out of local canal). But it turns out, they have been invasive in Europe since 1970s. Kind of crazy. It's Harris mud crab (Rhithropanopeus harrisii). They are native to US. Very versatile crab. They can live in both marine and completely freshwater without any issues. Not sure if they pose any kind threat to the local ecosystem, but they are still invasive. Don't forget to subscribe to my Youtubes https://www.youtube.com/c/CoolGobyFish
