Can you have a coldwater saltwater aquarium?

[TangerineSpeedo]

If nems are your main interest, I'd suggest looking at the Cnidarians available through Matsu Collections and Gulf of Maine, Inc. - between the two, they have a pretty solid selection of nems available. I don't know how compatible the nems would be with fish, though, so I'd suggest figuring out your favorite nems available and researching them to see which fish could work with them (if you need help seeing if any are compatible, I'm happy to help when I can).

Many Cnidarians from Matsu requires you to have a SCP to purchase unfortunately.