I recently had the chance to climb 'Akvárium' in the 'Pulec' area. While I don't have the exact grade for 'Akvárium', 'Pulec' in general is known for its challenging routes, typically in the high end of the difficulty spectrum. The rock was solid, and the movement was technical and sustained. The crux involved a tricky sequence through an interesting feature, likely the 'Akvárium' itself, demanding precise footwork and good body positioning. The overall experience was fantastic, a real test of both physical and mental strength. I highly recommend it to experienced climbers looking for a rewarding and challenging climb in a beautiful location. Make sure to check the local topo for the most up-to-date grading information.