ADVISED AGAINST FROG SPAWN

Apparently, frog spawn, which was next on our purchase list are a no no according  to Nano-Reef.org:

Corals with stinging sweeper tentacles such as galaxia and frogspawn corals should be avoided in smaller tanks. If they are kept near other corals, their sweeping tentacles will come out and night and sting or kill the surrounding corals. These will do ok in larger nano reefs, as long as they are somewhat secluded to a certain area.

Sadness!  Maybe our tank is big enough?  We'll see what else I can find on the topic.