I have a planted 55-gallon freshwater tank with sand substrate. I have 2 Fluval 70s (upgrading to the newer versions soon) and all water parameters are acceptable. The water temp stays around 78-80. Now my question is I want a semi aggressive tank with color and movement, that also won't devour plants. Currently, in the tank, i have 1 gold and 1 blue gourami, 1 small clown and 1 yoyo loach, 1 killie flag fish, bristle nose pleco, a cory cat, and 4 cherry barbs. Any recommendations on what would fit in the tank?