Picked up some sargassum at the beach today and put it in a container of sea water. I found an orange sargassum crab which will became a tasty treat instead of a DT killer when it grows. Also found the enclosed photos of a small whitish crab, a miniature sea slug half white half black and what I believe is an incredibly fast isopod ( definitly several segmented plated) it was a mottled paternity of black and white spots.
Do any of these deserve a spot in my DT or refugium?

Do any of these deserve a spot in my DT or refugium?

