I asked the same question a short while ago. Responses indicate that the original hood bulb would be sufficient for my 46gal FOWLR
. However, it was suggested that the 36" factory bulb be replaced with a Coral Life 50/50 bulb which is 30 watts. I followed that advice and bought the bulb. I held onto the original bulb to be used as an emergency spare.
Several annenpmes have developed on my LR
in the last few weeks. Most (not all) of them were aiptasia which I injected with lemon/lime juice. Only one of them has survived and it has beat 4 injections. I might have to use a hammer on this one.