1" is dinky, it's probably cute. I highly doubt it will eat your chromis or the firefish for awhile, or the shrimps for that matter. Live brine shrimp are probably the meal of choice for you right now.
If it did die, then you will probably never see it again as crabs and shrimp have a way of taking care of those things. Otherwise, when it gets hungry it will show itself.
Also in answer to your question, lions do enjoy hiding, some species more than others.
And IMO (not that you asked for it of course

) it is very risky buying such extremely young specimens due to lack of hardiness.
good luck
