I want to make sure my fish are reef safe.

hello, everyone!

I currently have an 8.5 gal tank with a hang on back filter and protein skimmer with in it.

I have a heater, a small powerhead, 9w blue led lights and 18w white lights (total of 27W).

I have a 2.5kg live rock, 1 Similar Damselfish, 1 True Sebae Clownfish around, 1 1" slug. (and I'm thinking of buying a Scarlet Skunk Cleaner Shrimp)

So are my inhabitants reef safe? I did do some research and I know that my clown is safe but what about the damsel? Lots of people say it's a devil and others say it's a good fish.

thanks!