I would ditch the emeralds as i have seen people say they get really mean as they grow. I believe if you do keep one i read it should be 1 to every 50 gallons. I would get some more blue legs. I would also get some small snails like ceriths or nerites. I hate the trochous snails they tend to die if not enough algae ime. I am only in the SW
hobby for 4 months though so I am still learning as well.
Sent from my iPhone using Aquarium Advice