I know of the care requirements. Some places say they are easy to keep if their care requirements are met, others say they are very difficult (i.e., difficult to get feeding, etc.). I tend to believe the latter, so I'm proceeding with caution. What I'm curious about is does one of the two commonly available species, Monocentris japonica and Cleidopus gloriamaris, have a better track record or are they basically equally difficult?