No doubt about it, he will need a bigger tank in no time, but for now, it may be okay. Keep an eye on your tank parameters. Lions create large amounts of waste and can greatly increase your levels if you are not careful and do not take the correct precautions. Also, keep an eye on your clowns. If they are small enough to go in his mouth, they will. He may not show interest right now, but when he gets hungry, those clowns might be a convenient food source to satiate his hunger.