how did you guess the sex of the front???? look up venting to find out the sex of the fish,
1- common name Kenyi... if it gets big and stays blue most likely female, turns yellow male
2,3 front good luck sexing unless you vent or wait for it to hold...
4 hap commonly sold as Ahli but not really its true name... research Sciaenochromis fryeri, tough to know if it is pure for sure... most likely male
5. peacock Aulonocara sp. if it gets color male... maybe hap... hard to tell... but also hard to tell purity...
where did you get them?
oh and these will not really grow up well together... Front will get huge, hap large, peacock okay, kenyi are mbuna and really mean... haps and peacocks can be laid back... too much so for mbuna... fronts really laid back... and are not from the same lake... may not do well with each other...
for mbuna need lots of rocks... hope this is a start