Originally Posted by Damped
Well the purple dottyback is aggressive so he can be added. Not sure about the chromis then.
Fish are funny creatures and sometimes general knowledge, while providing guidance for reef keepers, does not apply. I recently had to give up a Barlett's Anthias that was beating the crap out of my clowns. Also had an African Leopard Wrasse who ruled my aquarium. She went back to LFS
when I had a terrible Brooklynella outbreak three months ago.
Both these fish are classified as peaceful yet they found a way to be dominant and the Anthias was aggressive.
Bottom line is you will never know until you try and what I have learned over the course of 7 or so months of keeping fish is the more you like your fish the more likely you take care of it and keep it.
My only advice here is go slow and don't overstock for two reasons. First, fish will get territorial. You may notice that 4 may be the limit based on fish you select despite the fact that others are able to keep up to 8 fish in their 40 gallon. Second, if you start keeping corals you are more likely to be successful with lighter bioload. Good luck and post some photos of your clownfish when you get it.