An important thing to keep in mind that a tank's "biocopacity" is largely dependent on its biological filtration capabilities. A tank using a lot of LR
for bio filtration will be able to support a heavier load then, say, a tank that relies on a HOB
or canister filter. 80lbs of LR
is a great start, I would look to the future to plan on adding another 40-50lbs for maximum biofiltration. Even with little to no biofiltration, the list you suggest will still be pretty light. I agree about the mandarin, with a bit more LR
and a few months of matuity, I see no reason your tank should not be able to support one. A fuge would certainly help out and swing the odds in your favor. You also have some other great options for fish, sixline wrasse, purple firefish, royal gramma would all work well into your long-term stocking plans.