I got a new foxface last thursday. It's been 4 days now and he just hides away and isn't eating as far as i can tell. Any ideas on what I can do to help him out?

There is plenty of hair algea and other algea growing. I feed a variety of frozen food (mysis, brine, spirulina, formula1, zooplankton, phytoplanton, cyclopeeze). After a couple days of not seeing him eat, I added some nori (with garlic). Still not going for it.

Parameters are ok (0 amonia, nitrite, nitrate, phosphate; good temp, calc, buffer, ph, salinity, etc). Tankmates are a lot smaller and not agressive (pair o. clowns, banghi cardinal, bicolor blenny, scooter blenny.

Maybe I can turn off the lights for a couple days. But I don't know what else might help out.