Ypu could get most any inverts you like.
my personal favorite are shrimp. My first sw
tank was a 29g and it went really really well.
You could get a couple of peppermint shrimp, maybe a cleaner or two or maybe a fire shrimp, they are an awesome red. I also keep porcelain crabs and emerald crabs, those guys are very entertaining. And of course the requisite snails and hermits if you like them.
Now I read above where yous said you would go fowlr
if it meant getting to keep your dream fish, adn that would have been good for any lighting. BUT getting into nems you require pristine established water and super high light. Plus it's a crap shoot if the clowns will host or not, it's just as likely that they would host a rock or power head or coral. Oscellaris usually do better with the nem hosting though. My two sets were hosting a elegance coral almost to death, I had to give away the coral to save it.
What kind of blenny are you looking at? usually it's the gobies that require sand