I had one before, did fine @80F.
Cool fish, has a lot of personality. Mine was pretty small but would still mess with micro hermits, he was feisty. As they get bigger I wouldn't trust them with shrimp or crabs, but should be fine with corals.
He was eventually harassed to death by a 6 line I put in the system. My girlfriend cried, he was her favorite.:sad1:
edit: Sand Perch is the correct nomenclature (I believe that particular one is a "red spot sand perch"), though they are often sold as blennies or gobies or just rockskippers.