Plants and fish need not be present at all, but if they are, they must match what would be found in nature in the habitat being represented, as must any gravel and hardscape, and even the chemical composition of the water.
植物和魚類根本不需要存在，但如果它們是，它們必須匹配在所代表的棲息地中的自然界中會發現的，以及任何礫石和硬質地，甚至水的化學成分。