My opinion is no more fish other than what you just listed above. You can get away with shrimp here or there but they have very little bioload and don't affect your parameters a much as 4 fish do.
Not sure about the lobster, I would think it might eat your shrimp. but I really have no idea. lol
180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18