What are the scientific names for the port cichlid and flyer cichlid? I'll google them in a min and see if I can find out myself...
For the time being, the senegal and flying fox are fine together in that tank as long as the bichir doesn't prove to be one of the larger-growing individuals (you never know

) and eats the FF. Keep in mind that, though they rarely do so, senegals
can grow rather large (20" not being unheard-of) so, considering FFs get to only about 5", if the bichir were to grow to over twice the FF's size, you are running a risk - or, rather, the FF is - of becoming lunch.
Got the flyer's name:
Archocentrus centrarchus. These fish are aggressive, especialy when breeding. I noticed in another post you have them with cories - not a good idea. Your FF probably won't appreciate them either. Also, if the theoretical bichir was to grow enough, it could eat them.
Port cichlid:
Aequidens portalegrensis. These seem more suited to being kept with a bichir because they grow larger. They are less aggressive than the
A. centrarchus but I won't claim to know how the two species would interact.
I don't think the senegal is a good idea if you're going to have cories - or even the FF or flyer - in your tank as well. They could well end up as lunch. However, I'd also feel nervous about keeping a pair of the flyers in a tank with peaceful or semi-peaceful fish. They are a-kin to convicts in nature - simply not something I'd risk.
BTW, were you asking about
paratheraps synspillus? I assume you were. No, they don't stop growing. Even though I'm not sure and have never heard of this notion before anyway, there's little reason to believe otherwise. Regardless, it's best not to risk it if you are uncertain. It's all well getting 6" individuals and trying to get them to breed in the hope that they'll stop growing afterwards but there's no guarantee they'll breed (actualy, getting a compatible pair like that is rather difficult) and, even if they were to breed, it's doubtful this would prevent their further growth. Besides which, at only 6", they could also potentialy become senegal lunch

.