What tangs do you have? IME experience you will not be able to target feed a mandarin with these in the tank. I was successfully target feeding my mandarin in my 90g for 18months until i added a tang, now my kole bulldozes its way in and eats any food I target at the mandarin so don't count on this working.
I'm pretty sure the kole has also had a noticeable impact on my pod population, particularly those on the glass due to its constant grazing on film algae. just something else to consider in a small tank (mandarin-wise) with 1 or more tangs.
Honestly IMO your tank may be a little 'busy' with multiple tangs and a flame in a 75g to keep a stress free mandarin. If you are set on keeping one be prepared to add pods at regular intervals AND set up an
@PaulB feeder, which requires hatching of baby brine every day, if you aren't willing to do these things then honestly i would pass on a mandarin if i were you as your chances of keeping it alive will be slim.
I should point out that the above points still hold true for captive bred mandarins also, mine is ftom biota. They still need access to 100's/1000's of pods per day. I add pods occasionally in my 90 and also use the baby brine feeder as mentioned above daily.