No way a divider is going to make your fish unhealthy. They put them their so they can keep 2. In 1 tank otherwise the fish would kill each other. Im starting to wonder where you get your info because most of it doesnt sound right at all. Pellets should be a staple food everything else is a treat. New life spectrum is the best multi rounded pellet for the money. It doesn't make any sense that those flowerhorn foods would be cheaper. Like rd said go for the 5lb. bucket its worth the money.