Certain fish you just can't keep without a feeder.
https://www.youtube.com/watch?v=ROQgxQG_AFg
http://www.saltwatersmarts.com/diy-target-feeder-mandarinfish-pipefish-2804/
https://www.youtube.com/watch?v=ROQgxQG_AFg
http://www.saltwatersmarts.com/diy-target-feeder-mandarinfish-pipefish-2804/