I know you don't have any LR. That's why I suggested adding some, b/c you will need biological filtration, as your mechanical/chemical filtration will be stressed as the fish grow.
The wolf eel is commonly referred to as a wrasse or blenny, but it's actually a Pseudochromis. Similar to an eel though, it needs a tight-fitting canopy and prefers a tank with adequate hiding places. True eels aren't the only species that require hiding places, many fish species prefer hiding places, the Wolf Eel included.
Just FWIW, just some constructive advice for the future from someone who's been there (i started w/ a stocked 75g and no LR).