Do you mean the grey ceramic caves? I think the openings are too big to be attractive to Apistogramma.I know Cichlid Stones are made for African cichlids... But do any of you use them? Recommend for or against? Any chance a moss or fern would attach to one?
The holes are a bit big, although the fish may use them as cover. Mike will tell you that no fry will survive in your tank with those tank mates, but the "VKtech" caves in the second link could work as spawning caves if you 1/2 buried them so most of the entrance was under the sand.