Hi, I am contemplating adding new fish to my 180 gallon tank. I currently have 5 tiger barbs, 7 red tail barbs(avg 4 in), 4 gouramis, 1 large pleco(8-10 inch), 1 catfish(4 inch), 1 bala shark(4 in), 2 silver dollars(half dollar size). Am I overstocked at this point? Would I be crazy to add a...