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Found several of this guy in under the rocks, Search through several guides still couldn't ID it. Any idea? Is it harmful?

Hi everybody, I’ve recently started my very first saltwater tank and purchased live rock through KP Aquatics. So far I’ve been very happy with the rock’s shape and the amount of life that came on the rock. However, during a water change I spotted what seems to be a cirolanid isopod alive and well on the filter sock. Although this is the only one I’ve seen, I want to assume there is more of them in the tank to be on the safe side. At the moment I have added 0 livestock to the tank as it’s still cycling (added live rock and sand 4 days ago), so I’m thinking I could starve them out if I wait quite a while to add any livestock (longer than the cycle)...? I’m wondering if anyone has any experience in this situation, how long starving them out would take (if possible) or if they feed off anything else in the tank that would sustain them even if there’s no fish in the tank. Also wondering if I’d be safe adding members of a cleanup crew once the tank is finished cycling or if these would feed of all snails or hermit crabs? Thanks everyone.

Does anyone know what this is? It started growing on my live rock when I first got the rock. I’ve had the tank for around 2-3 months and it isn’t spreading a ton. Is it A majano anemone?

I have these small clear tentacles growing on my rock. Some even have tulip shaped cups on them? Is this the apocalypse? Someone please ID if you can!

One of my turbo snails has a strange hitch hiker on its back. It looks like another shell. At first I thought it was one of the baby snails on it's back just chilling. But then I saw what was in the snail and got concerned. The flesh did not look like the other snails, it was black. And it would occasionally stick out and poke around. I have no idea what this could be and researching hasn't helped me either. Would really appreciate some help. Here is a video of the hitchhiker: