Trifasciata Anomaly

[Jimmymud]

I have four Apistogramma Trifasciata,one is very clearly male with 2 others appear female.But the last one appears really different,it’s mostly grey but has the ability to change it’s pigmentation immediately like a cuttlefish!It can go almost black and then mottled in a millisecond,it does have blue spots on its cheeks like a male.It is more elusive and appears to be a completely different shape.It flares up and displays but has no spines,more like a uniform dorsal fin.
It was sold as a Trifasciata but to be honest I’m puzzled by it!
Can someone help identify or explain what it is please?
Photos attached of said fish and a male and a female and the strange one!

 

[MacZ]

This is not an anomaly, you got a Nannacara taenia there.

 

[Mike Wise]

Yes and they are from different areas of South America. On another note you probably will encounter problems mixing your apistos with other bottom-dwelling fish especially when they try to breed (and they will try).