They take to prepared foods quite regularly however, I don’t find a great nutritional diet in just prepared foods. These are a more active species of blenny and will prefer a larger tank in the long run. The species Im most knowledgeable on is Meiacanthus grammistes, the striped fang blenny. The venom consists of a neuropeptide also seen in cone snail venom, a lipase similar to the one used by certain species of scorpions and an opioid peptide. Blennies use it to stun predators. The venom seen in Meiacanthus reduces the blood pressure of the predator, relaxing its jaws so the blenny can escape. I don’t know if this species has the venom in meiacanthus however it is known to potentially nip at fish scales.
Sorry for the late reply, got sucked into a game of Monopoly for 4 hours haha.