Morning All, I have a 75g with trigger sump & nyos skimmer and currently I only have a pair of extreme black ice clownfish and no coral yet since the light purchase is my last thing to get. I am planning on a Fairy or Flasher wrasse(carpenter or McCorskeri), Coral Beauty Angel, Midas Blenny or starry blenny, Goby/Pistol pair, and maybe a one spot foxface. Here is my question: I also want 3 Kaudern's Cardinals and was wondering if I could do those 3 and also do 3 blue reef chromis? With the cardinal and or chromis, is a purple dottyback OK? Is there an order I should add these fish listed above since the only ones in my tank right now are the clownfish pair?
If you want 3 cardinals, go with Pajama Cardinals. They don't establish pecking order via aggression.
other notes on the fish you are considering:
a Peaceful Fairy or Flasher Wrasse would be an excellent choice as they will add color and activity to your tank and generally won't create problems
A Coral Beauty Angel added before corals isn't a good plan IMHO. If you do Corals, I would stick to Euphyllia as they tend to be less tasty to dwarf angels (My Coral Beauty takes the occasional exploratory nip at my Frogspawn and Hammer Corals and then spits the little chunk back out). They are also good at bouncing back. It also helps to have a well established tank with algae for them to graze on and daily seaweed feedings help too.
Midas Blenny can be a fin nipper
Chromis are just a bad idea, many people can't keep them from picking each other off
The Goby/Pistol pair is a good idea and many people enjoy the symbiotic relationship that the two form
The One Spot Foxface is a good choice, but a 75 gallon is really pushing it IMHO for one. I have one in my 90 gallon and I feel that is pushing it as well. If you get one, get it small
Any Dottyback outside of the Orchid is a poor choice IMHO. They are aggressive buggers that will attack fish 3 times their size. The Orchid is the best behaved of the bunch, but it's still a Dottyback, so keep that in mind