Hi Stacie, I feel Agonquin is correct, It's too small at this time to cause any problems. Bullheads are opportunistic feeders which means they will eat a huge varied diet depending on what they have the opportunity to eat. Bullheads will eat any alive or dead fish that fits in their mouth, any vegetation or muck they can manage to find, any kind of meat they find, but most interestingly they don't eat each other! A varied diet is the key to a healthy happy bullhead. Try frozen blood worms, frozen brine shrimp, sinking fish foods, and floating fish flakes that are all available at pet shops.
Bullheads are an attractive hardy species of catfish that have very interesting personalities to keep you entertained.