Mountain Rock Arch Aquarium Cave and Bridge | Aquarium, Vivarium and Terrarium Decor

Ready to use, install or paint. Your piece is 3D printed in your chosen filament colour and supplied unpainted. Enjoy it as it is or paint it to create your own finish.

Bring a striking natural element into your aquarium or enclosure with this layered rock formation, featuring a dramatic archway and an elevated bridge. Inspired by sedimentary rock formations, it adds both height and horizontal connection, creating a dynamic centrepiece that enhances depth and flow in your setup.

At a glance

• Sizes: See sizes below.
• Material: PETG, made for aquariums and terrariums. Resists water, humidity and heat lamps.
• Floats: Printed PETG pieces can float because they contain air. For aquarium use, secure the base with aquarium-safe silicone or a suitable aquarium adhesive as described under “Good to know”.
• Safety: PETG is deemed safe for plants, fish, insects, reptiles and animals.
• Finish: unpainted, in the colour of your choice.
• Made to order: ships within 7 business days.
• Free shipping: free delivery to Canada, the US and select European countries. Duties and import fees to Canada and the US are prepaid by us.

Sizes

Dimensions are width x depth x height.

• Size 1: 15 x 9 x 12 cm (5.9 x 3.5 x 4.7 in)
• Size 2: 18.7 x 11.3 x 15 cm (7.4 x 4.4 x 5.9 in)

Need a different size? We can scale it up to 31.8 cm (12.5 in). Contact us for a quote.

Details

• Sculpted layers, overhangs and recessed zones create hiding spots, shaded areas and swim-through paths.
• Well suited to nano fish such as tetras, rasboras and bettas, as well as shrimp and other small aquatic species.
• The archway and bridge form a natural passage that encourages exploration.
• Pairs well with dark substrates, moss and rooted aquatic plants in planted aquascapes.

Where it works

Freshwater and nano aquariums, shrimp and betta tanks, terrariums, vivariums and paludariums, reptile, amphibian and invertebrate enclosures, naturalistic builds, and tabletop gaming, D&D and wargaming scenery.

Colours

First choose a finish (Basic, Matte, Marble, Sparkly/Galaxy/Metallic or Glow-in-the-Dark), then pick a colour from that finish. Sparkly/Galaxy/Metallic includes our Galaxy, Sparkly and Metallic colours. There are 89 PETG colours in total, and the colour charts at the end of the photos show each one. Want something that is not listed? Contact us and we will try to source it.

Quality and care

Printed slowly at high resolution with thick walls, so it is sturdier than most printed decor. Fine layer lines and small variations are normal and make each piece unique. PETG is non-toxic and easy to clean with soap or alcohol. Colours can look slightly different on screen.

Good to know

• Anchoring in an aquarium: Bond the base to a flat stone or acrylic sheet with aquarium-safe silicone, or with hot glue or cyanoacrylate superglue specifically suitable for aquarium use. Follow the adhesive manufacturer’s surface preparation and full curing instructions before placing it in the aquarium. Where the design allows, a few small holes through the underside into enclosed air pockets let water in and air out, reducing buoyancy.

• Measure the inside of your enclosure before ordering, and leave a little room for installation.
• Some photos show hand-painted examples. This piece ships unpainted.

Design licensed to Molten Modern by Crizzy Designs.