First thing you need to do it find out the exact species. There are several species of Frogfish that could be/will be red.
Depending on the species, that 14 gal tank will not be big enough...and, if you plan to house it in the 75gal, it needs to be the only fish in the tank (which will kinda suck).
They're species only fish and will eat anything in the tank...even fish that are larger then themselves. Whatever they don't eat, will pick on them, to death.