I had a similar size pair of Crosshatch Triggers in my 270G display and they seemed a little cramped for space...a 75G is not suitable IMO. Actually that is one of the reasons I sold my pair, to get them into a bigger tank.
Any store that imports such expensive fish should have what it takes to take them back knowing they went into such a small display, even if you only get a store credit.
Perhaps consider setting up a quick 180G system, I am sure you could get a standard 6' tank and build a stand for less than you paid for the pair of fish.
Havinf owned a pair, seeing these fish with a little more room to operate will be much more enjoyable - they are truely spectacular and worthy of investing in a little more space for them.
Good luck with them.
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I'm out. 
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