I also thought that they only lived in symbiosis with echinoderms but after some research I found out that it is not symbiosis but commensalism (hopefully I wrote that correctly).
I see them taking dry, live and frozen food so I am hoping for the best.
Although they were sold to me as a pair I must say that they do not spend much time sitting together. But as long as they do not act agressively towards each other I am fine with that.
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