When i had my rtc he would eat needle fish 3''s bigger then he was. When he ate my first needle fish he had it sticking out of his mouth for a day and you could see the head poking out of his side. So just remember to keep them full or with things that wont fit in there mouth. For me it was one of the biggest fish buying mistakes so far, when i bought him i was a noob at fish keeping and he was only about 1'', he quickly grew to over a foot in my 55 in a little less then a year. But i suppose if you have a large tank then it should be good.