Firefish are natorious for being very shy and skittish. I am almost certain he is hiding. They are long, skinny fish, which means they can get into tight spots we can't always see.
I purchased a purple firefish a few weeks ago, and he hid for a while when first introduced. Be patient, he is more than likely in there.
I'd suggest taking a good hard look for him later on. They can hide very well. And yes, it would hide for this long, he was only introduced last night.. sometimes it takes a couple days... be patient and keep your eyes on things.
Good luck,
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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