Hap is short for Haplochromie which are more bigger open water types. A 37 gallon won't work for a Venustus when full grown. Aside from it being a bit aggressive, the sheer bulk even females get to be, it will be cramped in that footprint. My 2 year old full grown adult male is at least a good 10 inches might be more. Nice looking fish, but these guys get big.
That unknown blue one, I'm not leaning towards Metriclimea Lombardoi (Kenyi) as the bars look a bit thing on them, and the usual bars you see on that species are usually thicker and have the same patterns similar to a Astilapia Lafasciata (Zebra Obliquedin) It's not to say a Lombardoi can't have this, but usually you don't see quite so many and they are usually more thick.
Where did you get these from? If you didn't pick these up from a private breeder and rather a chain store, there is a chance it could be a hybrid. Have to factor that in. Many chain stores and bulk stores that are corporate are contracted in to having to buy from commercial breeders, and mass commerical types, don't always have the best set ups going. They need sheer numbers, so your gene pool can get a bit screwed up in these operations.
I'd like to take another look again, but posting blocks me from viewing and posting. It has a similar pattern to that of even Ps. Elongatus, and Ps. Demasoni also, but not quite the same.