To be fair, not at all to undermine black molly you should always add the most peacefull fish first and only when the water chemistry is stable and all ok. When you add an agressive and territorial fish first the fish will make a large portion of the tank theres and defen it from all new additions, which could stress the new fishes or kill them.
With your lighting a red and white bulb shouldnt really be used unless you are looking at a fish only system. I do not know how much lighitng your tank has but to support the corals you said about youd need probably 2- 4 T5 tubes in the marine spectrum. This means you have marine white (can be anywhere from 7k to 10k) and actinic tubes (theese are blue to recreate the water colours that corals use to photosynthesise, as all other colours are pretty much filterdc out of the water in coral reefs because of the depth)
Now a saltwater aquarium cycles by the addition of live rock (we dont do fish cycles as there is no need to in marine) The live rock has some die off when it is taken out of water and transported to a different tank, this will cause ammonia, nitrite and nitrate to spike. After a while when your stats start falling to practically zero you can think about adding thinks like snails, crabs andshrimps (this is your clean up crew adn they will eat all of your algae or scraps of food so they dont pollute your tank) Also it should be noted that these should be added when you start getting brown algae everywhere , that is know as diatom algae and that these can all be aded at once. IMO though shrimp should be added when you add fish because they tend to scavenge bits of left over fish food, and not so much crap of the floor. Anyway after youve added your clean up crew you should wait a week or two before adding fish. This is when you add your most peacefull fish or fish's. You should be careful to feed lightly and with flake food, supplimented with a frozen marine food like mysis shrimp.
For your first fish i would recomend eitehr occelaris clownfish or percula clownfish, any type of chromis ; like green chromis or blue reef ones. Also gobies are very good as second fish.
Some advice also erm use only RO water for a saltwater tank, when buyinga skimmer stay away from makes such as sea clone or red sea and most improtantly Do not under any circumstances rush.
hope i helped bit
