I have done this would both a Dwarf Fuzzy Lion and a Volitans.......
Get some fishing line (if not thin thread will do). Take a piece of frozen krill - as "whole" looking as you can get it, and tie the fishing line around its tail (loosely). Then dangle the shrimp around the lion.......
Try and be as "realistic" as possible......... drag it along nice and slowly, then "twitch" it a few inches, the way a shrimp does.......
Only do it for a minute or two, then remove it if he doesn't bite. He'll gradually take more and morei nterest in it, until he bits..... took mnie 4 or 5 days and within two weeks they would take anything meaty dropedu nder their nose.
My wife used to feed the volitan with chop-sticks! I had a pink tail trigger that would eat all the grub first otherwise.
HTH
Matt