Was snorkeling with my 4yo in July and came across a decent sized octopus curled up under a small bit of coral substrate on the reef flat, in about 40cm of wate

Was snorkeling with my 4yo in July and came across a decent sized octopus curled up under a small bit of coral substrate on the reef flat, in about 40cm of water. Wasn't able to id it properly, but we sat there for 15 minutes watching each other. Longest the kid has ever sat still in one spot. Cephalopods are without doubt the coolest fish in the sea.