You can find the moss balls on Amazon. I recommended making sure it's not a fake one with metal wires but real full balls. The vendor I bought it from went under, but you can find them.
I put them in this breeder. And used some zip ties to keep it shut. It just hangs out at the bottom of the tank. It works great.
Alfie Pet - Comi Hang-on Nursery... https://www.amazon.com/dp/B00JVIYWS8?ref=ppx_pop_mob_ap_share
>I’d actually put the Domino in an acclimation box
That link is what I have for the Domino without the divider in the middle, How long would you leave the Domino in it before reintroducing?