Sharks and urchins and even moray eels? Compatibility?

[LadAShark]

Is it possible for them to coexist, given that the urchins are pencil/tuxedo urchins, and the sharks are catsharks, eppies, or white spotted bamboo sharks?

I'm worried that (1) the urchins might poke the sharks, even though they are not venomous urchins. And (2) some of these sharks might actually try to bite into the urchins/have a way of eating them that I haven't heard of. I wouldn't dare put a horn shark and an urchin together, but I'm wondering whether other sharks will have problems with them? How about stingrays? Would they have problems with urchins?



As a side question, how about moray eels? I'm under the impression that morays aside from the snowflake and the zebra are all risky towards the sharks, and that the other way around applies as well, as sharks may attempt to take a bite out of them.

 

[Zoodiver]

Yes, very possible with the species of sharks you listed.
Some rays are questionable in most common home aquarium set ups. In bigger pools/ponds, they can be done as well.

For the eels, it will come down to set up and the personalities of the sharks and eels. I have had sharks eat eels, I have had eels eat sharks and I have had them together without any issue at all.