If you want 3 tangs go with 125 gallon and keep 3 different species of tang. That will reduce fighting, also good suggestions for begginers would be cardinalfish, gobies, blennies, clowns, grammas, dottybacks, wrasses and hawkfish. My favorites include, Purple Fire Goby (purple firefish), Fire Goby, True Percula Clownfish, Royal Grammas, and Achilles Tang, Pacific Blue Tang, and Christmas Wrasses.