Minecraft wiki entry for Adding_beauty_to_constructions, associated text: Place the stairs upside down, and facing out the way the ice is. The player can also build an actual fish tank with using glass (not panes, as water will flow through them) and fish buckets. First, build a box out of glass, and then fill it with the fish buckets and buckets of water. It is possible to add some seagrass, kelp or sea cucumbers for decoration, or even coral blocks if the tank is large enough. A larger tank can be used to hold squid and, if it has an open top, dolphins, but will be quite hard to create in survival. A tank holding guardians is also possible, but should be only done in creative, as guardians are extremely hostile towards players. Squid should never be held in the same tank as guardians, as guardians will attack them, eventually resulting in the squid's death. Silverfish, despite their name, are not fish, and will drown if placed in a fish tank.