I have a small 7g that has been running 4 or 5 years now? It is just a 1/2 inch acrylic AIO from Micro-Reefs. Light was a coral compulsion Par38 for the first few years but is now a Nano-Box Tide. I use a MP10 for flow.
I have many different anenomes, I had a fluffy sculpin and crevice kelpfish but lost them in a power outage, the nems fair well with swinging temps though so didn't lose any of those. I have a 1/15 JBJ Chiller set at 55 degrees. I feed frozen mysis or LRS every day but used to feed weekly which was fine but they started making babies when I started feeding more.
I have matrix in the back chamber because my rock is not porous and use filter floss. I am slowly working on setting up an algae scrubber. I try to do water changes weekly but its more like every 2 weeks or monthly.
The original cycle took MONTHS for me since it is cold water.
A good resource is the Cold Water Marine Aquarium Owners group on face book. I know Matsu Collections sells cold water live stock, there are some others I can't remember. I sold a few of my own nems when they made babies/split.
2019-01-26_06-44-03 by
Tana Jahangier, on Flickr
IMG_20181213_193822~2 by
Tana Jahangier, on Flickr
cwtnems by
Tana Jahangier, on Flickr
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Tana Jahangier, on Flickr
2018-04-04_12-17-38 by
Tana Jahangier, on Flickr
2018-04-04_12-17-26 by
Tana Jahangier, on Flickr