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I`m afraid you have replaced it with a macmasteri "female"..!!!
I would have a go with the 1st one!!!(Most probably a female I`d say/guess..!!).. and give them a month or two to adapt to the situation..
(unless aggression is increased too much.., I couldn`t see any broken fins on the 1st one though..)
Males will show dominance to all other/new fishes if possible. New females in a territory which are not ready to spawn will also be chased away.. until they show him the correct signals to reproduce!! (Large females may beat up a "weak" male!!)
After the 1st spawn a female is most often "approved" by the male, but will have to show submission until next spawn..(Displaying her belly+ not raising her dorsalfin , and act like she is not challenging him !!)
In your pic with the two hongsloi , the young male looks like he is quite relaxed toward the other one (female?)..!!
Many thanks willzs..
..it is the result of 30-35 years of practice+failure.. and still learning!!! ( Or as a friend of mine constantly reminds me..,
- "Make sure you don`t fail with the "wrong"/rare species.. Cause if we/you do., we will soon have very few left...!!" )
.. nevertheless..,some factors may also alter what we normally think we know about about behaviours+ else !!
How do the Stiphodonatropurpureus(?) act/interact with your Apistos??? .. is it aggressive../"the Boss" of the tank??
If so, I guess this may stop the hongsloi from spawning or mess up your possible plan for any/many future Apisto-fry !!??
It might be a difficult task for a young hongsloi male to manage/maintain a territory of his own then.., on the other hand it probably will give the two hongsloi some time with the same conditions.. later when the hongsloi male gets the chance, he will become the dominant one!!
For the hongsloi to spawn you may have to remove the dominant Netz male( if possible ) !!??
.. and maybe also add some "tight-entranced" caves .. like sliced/cracked clean coconut-shells..( females will often dig out a wall/pile of sand in front of the entrance after spawning anyway!!)