The green stuff is a nuisance algae. It and the cyano
feed off of the nutrients in the water column, aka what you are using to cycle the tank. Don't turn on your lights and it should fade away. You can also scrub off the algae in a separate container and put it back into the tank.
48 hours of having a shrimp in the tank will start your cycle, so you should be seeing some ammonia readings. Keeping the shrimp in there will keep providing ammonia through the cycle and once you get no detectable readings of ammonia and nitrite after you see them spike up will mean you are cycled.