The same caution basically applies. The main concern with the lion is not realy a matter of compatability but rather is the chosen tank mate large enough to be avoided as a meal.
If you get a smaller volations the chances are better for other fish. The crab is no different. If small enough, it will become dinner. The flame angel if large enough would be fine. They are also rather skiddish, so it will avoid the lion as much as possible but there are no guarantees. Having LR
for hiding spaces would reduce the risk.
The tang would not be a good choice. They are both large growing species and the lion itself can/will get up to 13-15". It too may also outgrow the tank in time. Adding another large growing species would cause problems.
To be completely honest, this type of lion is best kept in a much larger tank FO
and with other aggressive fish. It will however do fine by itself in the 75. It is definately not considered "reef compatible".