I had one for awhile. They're active at night and super spooky. I kept it in my 150 & target fed it various things (oyster feast, roti feast, cyclopeeze, phyto) 4 times a week.
I used such variety because I couldn't find any reliable information about what they eat. I was told there is dispute about this among biologists. It seemed to respond to my feeding, but it slowly deteriorated, shedding "fronds" over the course of a few months.
I would definitely get another one if someone told me how to keep them long-term. I don't like to buy creatures, even crazy cool ones like this, if I cant hope to give them somewhat of a life.