Here is a complete, structured summary of everything we've established, built, and revised so far. You can copy and paste this directly into a new chat to instantly bring the model up to speed without losing any progress. Aquarium Build Context & Master Summary 1. Hardware & Dimensions Tank Size: 20-gallon long (30"\text{W} \times 12"\text{H} \times 12"\text{D}). Filter: 3\times3\times7" vertical filter positioned in a rear corner. Substrates: Pewter gravel (left/ruins zone) and Midnight Gold gravel (valley/dungeon zone). Lava rock is used only as underlying structural support to build height and will be fully covered by substrate. 2. Physical Inventory & Core Items Buddha Statue: 11" tall, sitting elevated on a 5" substrate/rock terrace on the left side with a waterfall cascading down. TARDIS: 9" tall remnant prop. AT-AT: 6" tall walker prop. Lego Rainbow Dungeon: 5\times7\times8" box positioned on the far right. Closed on top (covered in substrate and moss, no built-up stone spires), but open in the front to reveal the brightly lit rainbow interior and two Outkast minifigures inside. 3. Narrative & Structural Design Rules Subterranean Tunnel: A fully buried, continuous underground passage running from an entrance beneath the Buddha terrace directly into the Lego Dungeon on the right. Tunnel Peeks & Lighting: The tunnel interior is lit. Along the middle of the tank, the substrate/rock above the tunnel has a small crumbled gap to give a subtle peek at the warm Ver mais