I have two purple firefish, they share a burrow (it might just be a space under a rock, I can't tell). One almost totally lost his little signalling dorsal fin when I first got him and it's not completely grown back so I can tell them apart, which is how I know that I sometimes go three entire days without seeing one of them. Usually around half way through the third day I'm convinced it's been eaten by a nem/jumped/died, then bam, day 4, there it is eating and swimming around looking totally normal. I think that's pretty normal behaviour for them.
+1 on them being good jumpers though, if you've got lights that come on or off suddenly you'll want to invest in a good cover if you don't have one already.
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