Yep, definitely cacatuoides. Arguably the easiest apisto to breed. They are lovely little buggers! A shop called the "Puppy center" in Hartford CT sells them. Also, another shop called "Aquatic Wildlife" off exit 63 I84 east sells them. Two excellent shops.
I used to breed Apistos back in NC. What a wonderful time! Now I'm in CT, and will get back in the hobby soon. They are really lovely and amazing little cichlids, come in compact package but with full cichlid intelligence and the fighting spirit.
If you are new to this species, I suggest start with A. Borelli, much easier on water parameters.