Yeah since you mentioned the shelves I've been thinking of different ways to do it so far I'm thinking multi tiered driftwood columns with stone tops maybe and also doing some suction cup/silicone acrylic shelves those I would probably coat with silicone so I could decorate them with sand, plants and small rocks.
Just make sure it’s very sturdy and strongly secured to the glass cause ones the waters in you pretty much have to live with it
