i have had my Moorish Idol for about 3 weeks now ... he is in a 6 foot long 120 gallon acrylic tank. he is eating like a pig .,,, i feed him frozen squid ,,he loves it...people are very surprized that my moorish idol is eating but he is doing great...so im not sure why they say that they are hard to take care of.... i did my research on them before i bought them to make sure that i could have one in my tank...