The Redtail Tamarin is a very difficult fish to keep and has a long history of doing poorly in captivity. Many people think getting them eating is the problem but that’s not true. Many of these wrasses will eat almost any food offered even on the first day. The truth is, no one really knows why they have such a poor track record. There are many theories, however. These wrasses are beautiful as you can see in the picture above. They are sand burrowers so they should be offered a sand bed in captivity. It is a very active fish and should be fed several times a day. I would not attempt to keep this fish unless you are prepared to treat it for internal and external parasites or bacteria (one of the theories behind its mysterious track record). They max out at about 7 inches. Females change sex in the absence of a dominant male. These fish are sexual dimorphic.