One of the other things to consider with small tanks, is that they quickly build up nitrate, unless water changes are frequent.
Most Amphiliphus are lacustrine species, they live in large lakes, or in clean rivers with a very low nitrate load, much of the time less than 1 ppm.
So although nitrate is not often seen as an acute problem, it often manifests in chronic nitrate poisoning (HLLE, and other bacterial diseases associated with high nitrate you see when oscars are turned into LFSs, scarred, deformed), which occur unless you are willing do number of large water changes per week.
Fish that are tolerant of nitrate, and that type environment often have the ability to use atmospheric air, like the anabantids that live in rice paddies, or climbing perch or the catfish able to walk away to better conditions.
A 70 gallon, 3 ft tank is about the size of a large puddle, or maybe a rut in the road, not the kind of place you'd find large cichlids, unless they were trapped, and soon to die.
Just a little food for thought in making stocking decisions.
I agree sajica is a another good suggestion