Kole tang won't be your biggest prob ...... You have between 3 and 4 algae eaters, in the angels and tangs. Personally you might want to rethink the angels side, 75 gal you might be able to get away with two angels, coral beauty's are a great fish to have but flames pop. Your other prob might be the dragnet.... How old is the system and do you have a refuge to breed pods...... Basslets and dotty backs are sweet looking colours but you can only have one, they will fight, and damsels can be out right mean. Also what order are you adding the fish the more aggressive fish should be added last and if you do go with two angels add them together at the same time, better chance they will get along... Same with tangs
Spinach will be the tangs and I know coral beauty's fav food I add it to a clip and stick it on the glass ..... But turbos snails love it too.
Fish that you might consider replacement is maybe drop the lemonpell angel go for a anthias to swap out a algae eater for a carnivore ... .. Only thing they need 3 to 4 feeds a day and jump