My angel got kicked out of his night time nesting spot by tiger pistol and YWG, he now swims up to the opening and fans it with his fins, kinda like some cichlid fanning eggs. The shrimp will pop off at him and he'll swim away only to repeat a few minutes later. The angel hasn't shown any direct aggression at either the goby or the shrimp when they're out in the open, the shrimp has charged at him though.