hi i have brought a fish tank about 2 months ago it is fully cycled all tests spot on tank size 36 inches long 14 inches wide 18 inches tall the tank holds about 36 us gallons i currently have 2 mollies 1 dwarf gourami 2 corys 2 small fish not sure what they are chequerd body whith red fins and rail and black trim about 1.5 inches long i would like to add more fish as tank looks empty i would like some advice on what type of fish i could buy that will get on whith my current fish i would wonder if i could add some more gouramis as i liked the pearl ones and some angel fish and maybe some silver sharks and how many i would it be best to get smaller fish and what type . many thanks