Zebra Dartfish

I added 3 zebra dartfish to a 90 gal mixed reef about 5 years ago. They were added at the same time and were model citizens. One disappeared about year ago and one died last week I assume form old age. Never showed any sign of illness or injury just kinda stayed at the bottom for a day or so then passed.

I was thinking of getting 2 or 3 new ones to add. Will they get on with the existing one?

How about a purple firefish with a zebra?
 
Adding new zebras should be fine. They are not aggressive fish, plus they prefer to be in schools. Not sure how a purple filefish would do.
 
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