4. You may need much less parts to build usable caves (ie: a single pot or saucer for each cave). With rocks frequently you’ll want several items to produce caves and hiding spots. Aquascape Dialogue Aquascaping is as much an art as It's really a science. Here is a forum https://www.whofish.org/Default.aspx?tabid=45&modid=379&action=detail&itemid=301302&rCode=33