I had some old macro-riddled rock that I put in a tub in the basement at around 65 degrees and ran a skimmer on but had no light or other circulation or aeration for about 6 months... only topoff water. When I pulled out the rock, there were hundreds of these things on it, along with an amazing amount of other life.
Some of our little sea friends are quite hardy.
Tom Siler
Columbus, OH