I'm setting up a new 75 gallon and two of my local fish stores have some great deal on fronts, a fish I've always wanted. One store is selling two beautiful fronts both approx 4-5 inches for $99 for the pair. The other store has juveniles for $29, approx 2 inches. Should I even bother trying to put the two in a 75 or 3 juvies in the 75? Unfortunately I can't afford a larger tank at this time.