I'd say there are 12+, I have five medium \ large pieces of mopani and malaysian driftwood, a large artificial tree stump with multiple openings, and currently 12 plants. The knife hides in the top of the stump, the featherfin in an outer knot, the rainbow shark underneath a middle piece of wood that I propped up to make a cave, the ctenopoma in my biggest piece of mopani, and everything else hides in the plants and any piece of wood they feel like at any given time.