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I going to do it. I am going to buy a Spiny Peacock Eel. Now when I quarantine him should I put gravel in the tank or no. My thought is that if I put gavel in there he will bury himself and I will not be able to see him.
Also when it goes in the main tank and I'm cleaning the gravel, will I hurt him with the gravel cleaner or do they get out of the way.

You're always better to have a sand substrate with burrowing fish. Not only is it easier for them to dig into, but since the crud collects on top of the sand rather than sinking between the pieces of gravel you don't need to worry about where the fish is hiding.

A quarantine tank should be kept simple, so I wouldn't bother with a substrate. instead put in a piece of decor that the fish can hide inside for the 2-3 weeks it'll be in there.

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IMO, you can't hurt a fish when gravel cleaning without sucking them up and tossing them out with the rest of your waste water. I've actually had a Neon tetra disappear like that back in my negligent beginner days.... I once had a curious little Xenomystus nigri (African Knifefish) that would actually come by and investigate the siphon... Every now and then he would get sucked up and I'd have to stop the pressure to let himself get out of the way. Most fish will get out of the way if they're bothered by the siphon.

Agreed with the quarantine as well; it should be fine for a couple weeks without burrowing itself.

Plus, I think you tend to be able to see eels. I haven't kept one but I think they usually stick their heads out of the substrate.

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