New member here. A couple months ago, my now 10 year old took his cast net that he had begged for (thanks YouTube) and caught a couple fish. They were all pretty small and he brought them home and put them in our aquarium. Within a couple weeks, I realized that we now have 2 smallmouth bass and 1 largemouth bass a shiner and a bluegill. The largemouth and 1 of the smallmouth have doubled in size. The other smallmouth has only grown very little. Only eats fish flakes. Won’t have anything to do with minnows like the other two. Ideas?