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If the drift wood has caves in it they will use it. They are cave spawners so expect them to want something to lay their eggs inside. On a side note, I use old 35mm film canisters. The 1 hours photo places are more than happy to give them to you.
When given a choice, my apistos seem to prefer a piece of driftwood. If the choice is terra cotta or coconut, they will choose coconut. So far that pattern has been consistent with all the apistos I have kept. Also for the Pelvicachromis taeniatus.
ime, it greatly depends on how much pressure there is in the tank from other fish, what type of spawning substrate they will use. i have a 90 gal tank with only 1 male and 2 female cacs. one female laid in a deep crevice in a piece of driftwood, even though there was a clay pot for her. in tanks with lots of other fish swimming around i've found they will always use tightly enclosed caves, like pots etc.
I posted that last response, and then went down to the fishroom to feed. I have a group of five A. veijita (1 male and 5 females) crammed into a 15 gallon. I had planned to remove the extra females once two start to spawn. The largest female spawned a week ago and chose to lay her eggs under driftwood. The second largest female spawned today... in a clay pot. Rick makes a good point though... that pot is the most protected space in the tank.