Nice shot, but this is a bigeye (family Priacanthidae; exact species on this photo is probably popeye catalufa, Pristigenys serrula) rather than a species of squirrelfish (family Holocentridae). The two families look somewhat similar and bigeyes are sometimes mislabelled as soldierfish/squirrelfish, but they are not closely related.
Thanks for your complement, and thanks for the information correction. I'll see if I have the sign for the tank in my photos, but for now I will rename it to popeye catalufa.
