FOWLR plan, will it work?

[Aquattro]

IF the clown accepts the torch as a host, the torch will eventually become stressed and likely not open. You'll need a very large torch to be able to withstand a clown for any length of time.
Last time I had a clown and a niger together, the clown was killed.
How big is this NIger? After about 5 inches, it will eat your hermits. The wrasse may also enjoy hermits if it is big enough.
You probably have to decide whether you want a predator tank or a reef; you can't have both, at least not in the long run.