ive had 3 diff ones, the first 2 jumped out and the third didnt eat much,, was more of a picker, didnt really eat food i put in there, he got really skinny... then jumped.. im guessin you need alot of fish for him to pick at to get the parasites and what not he needs,, they are a great fish and i loved having one, very active zipping around all the time... i would like to try one in the fowler..