Depends on the dimensions... If its 75 gallons and short and tall that kinda limits you.... I'd say I'd prefer two shallower tanks (say 18" deep) with medium sized cichilds. So You have the option of separation and not mixing the wrong species. If you wanted one or two Bigger fish I'd go for the larger tank.
As I've said before it would be best to get rid of the moat and argentea. So the you could have some dithers in with the terrors and maybe a small cichlid. Then some medium sized ones in th 75the 135 is 72" L and 18" W
The 75's are 48" L and 18" W
I am debating what to do with my current stock.
Female Festae, Male Green Terror, Male Motaguense, Male Vieja Argentea...
Will certainly have to re-home one or 2 either way. Really need help deciding what would be best.
6-8inch fish like blue acaras, firemouth, salvini, sajica, etcYeah the idea was to have perhaps the Mota as a wet pet in the 75...
By small Cichlid, what sort of species are you referring to? Convict?
I switched from the larger SA/Ca cichlids to a 75 with the smaller ones like Alex recommended and couldn't be happier. If you keep any of your stock besides the GT your 135 is your only option.