I am a beginner when it comes to octopuses and got mine 3 days ago. During those days I've tried to feed it but he mostly just out during a few hours during night (I have camera that's recording 24/7). Since I don't want the food to just lay there and making the water bad, I want to put it as close to the octopus as possible so it can grab it if he wants, or I can remove it if he doesn't want it. The problem is that he's small and can easily hide in and under my live rocks. I basically have to lift all the rocks until I find him and I assume that scares him. What should I do? And how long can an octopus go without eating?