Hi apisto-philes, i saw apistos spawn in: - -coconut shells - -clay and plastic flower pots - -rock builded caves - -on filter sponges - -plant leafs - -..... - -and even on the front screen of the tank. If they are breedy they just do it whether there is a cave or not. With cave is preferable to spawning on filter sponges or heaters. Give them a any cave and they use it (i'm not informed on colour-phobie as was mentioned before). It's up to you to decide which material. Thomas