Sorry; I can't be much help here. We've gotten the forktail into the shop a few times but they haven't stayed around long enough for me to get much insight into their behavior. They like live brine, didn't seem to be fussy eaters as they took the frozen brine and krill too. We had one that jumped

so some screening or eggcrate may be in order to keep down the fish suicide rate. They also like to kind of stick themselves to the glass, especially in the corners of the tank. The first time I saw that I thought for sure the fish was a goner but he swam away quick enough when I went after him and I later observed other forktails and midas blennies do the same thing.
HTH,
~Alice
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Reefkeeping is my life; I can't afford a hobby too!