Why do fish and shrimp need hides?

Hides give fish and invertebrates a place to retreat when stressed, rest between feeding, and establish territories. They mimic natural environments, making your aquarium inhabitants feel safe and secure.

Are 3D-printed aquarium hides safe?

Yes — when printed using aquarium-safe materials like PETG, hides are non-toxic and safe for long-term underwater use. Our designs are made to be smooth and snag-free to protect delicate fins and antennae.

How big are the entry holes?

Each hide in this set features 2.5 cm (1 inch) entry holes, ideal for shrimp, guppies, corydoras, and even small plecos. These openings are large enough for easy access while still feeling safe and enclosed.

Will these hides work for plecos and bottom dwellers?

Absolutely. Plecos, corydoras, loaches, and other bottom-dwelling species love having multiple sheltered areas. The 3-piece set allows you to spread hides across the tank to reduce competition for space.

Do the hides blend into aquascapes?

Our coral-inspired texture and neutral tones make them perfect for both natural and stylised tank layouts. They can be placed among plants, rocks, or driftwood without looking artificial.

What are aquarium hides used for?

Aquarium hides provide shelter and a safe retreat for fish, shrimp, and other tank inhabitants. They reduce stress, encourage natural behaviours, and create a more balanced tank environment.

Why choose a 3D-printed fish shelter?

3D-printed shelters are lightweight, durable, and can be made in unique shapes and textures not possible with traditional resin decor. Our designs are made using aquarium-safe PETG material.

What size fish is this large shelter suitable for?

Our large coral shelter measures approximately 13 x 13 x 13 cm with 2.5 cm entry holes — perfect for small plecos, corydoras, shrimp, and medium-sized community fish.

Is this shelter safe for planted tanks?

Yes. The smooth PETG finish ensures it won’t damage plants or fish, and its coral-inspired design blends well with aquascaping layouts.

Can the large shelter be used in saltwater aquariums?

Absolutely. PETG is non-toxic and suitable for both freshwater and saltwater tanks, making this shelter a versatile choice for a wide range of aquariums.

What size cave is best for bettas?

25–30 mm entrances suit most bettas, giving them shelter while still letting them turn and swim out.

Are 3D-printed caves safe for shrimp and fish?

Yes — our caves are made from aquarium-safe PLA/PETG with no coatings or paints. Always rinse before placing them in your tank.

Can these caves be used in saltwater tanks?

Yes — the material is inert and unpainted, making them suitable for both freshwater and marine aquariums.

Where are Blubber Cove caves made?

Every piece is designed and 3D-printed in our UK family-run workshop, tested in real aquariums, and shipped quickly.

Where do you ship from?

All orders ship from Northumberland, UK. Dispatch usually takes 2–4 business days.

Do you ship internationally?

Yes — tracked international delivery is available at checkout. Shipping times vary by location.

How do I track my order?

Once your order ships, you’ll receive a tracking link by email. UK parcels are sent via 48-hour tracked service; international orders include tracking.

Do you take custom requests?

Yes — tweaks, scale changes, or new ideas are welcome. Contact us via the site and we’ll confirm what’s possible.

What materials do you use for aquarium décor?

We print in PETG or PLA depending on the design. Both are aquarium-safe plastics that won’t leach chemicals. Pieces are finished smooth to protect fins, shrimp and snails.

Are your aquarium products fish- and shrimp-safe?

Yes. All tank items are designed for fish and shrimp use with no coatings, paints or glues — just inert plastics hobbyists trust.

How do I care for aquarium décor long term?

Rinse in tank water during water changes. Avoid boiling or harsh scrubbing. With light care, the décor lasts for years without warping or releasing toxins.

Do your floating hides actually float?

Yes — each one is buoyancy-tested before shipping. Some tanks may need a gentle nudge or a suction cup to settle them in place.

Can shrimp or fry use these caves?

Yes — caves are designed with small entrances and smooth edges so shrimp, fry and nano fish can hide safely without risk.

Can I put the décor straight into my tank?

Yes — give it a quick rinse in tank water first to remove dust and help it settle naturally.

How many cards fit in your deck boxes?

Most designs hold 100+ single-sleeved Magic: The Gathering cards with room for tokens or dice. Check each listing for exact capacity.

What materials are used for deck boxes?

Durable PLA/PETG that keeps its shape over time. We craft in small batches so every hinge and latch is tested.

Can I customise a deck box?

Yes — custom requests such as scale changes, colour swaps or simple engravings can be discussed via our contact page.

Are Blubber Cove aquarium ornaments safe for fish?

Yes — all décor is printed in aquarium-safe PLA or PETG with no coatings or paints. Smooth edges protect fins, shrimp and snails.

Can these ornaments be used in betta or shrimp tanks?

Yes — entrances are sized for bettas, shrimp and small fish. They provide secure hides while blending into natural aquascapes.

Do your floating hides actually float?

They do — each floating piece is buoyancy-tested before shipping. Some tanks may need a gentle nudge to settle in place.

Where are your aquarium accessories made?

All pieces are designed and 3D-printed in our UK family-run workshop, tested in real aquariums and shipped directly from Northumberland.

Choosing the Right Aquarium Cave for Your Fish or Reptiles

August 8, 2025

Aquarium caves aren’t just decoration — they’re essential hiding spots that help fish, shrimp, and other aquatic creatures feel safe. But with so many options out there, how do you choose the right one for your tank? This guide will walk you through materials, sizing, and design tips so your aquarium cave blends beauty with function.

Why Do Fish Need Caves?

Fish and invertebrates use caves to:

Hide from stressors or aggressive tank mates
Mimic natural environments
Rest without constant light exposure

Safe hiding spots lead to healthier, less stressed fish — which means more natural behaviour and better colouration.

Looking for safe caves for shrimp, bettas and plecos? Explore our UK-made Aquarium Caves Collection here

Best Materials for Aquarium Caves

When it comes to choosing a cave, material matters for both safety and durability:

PETG — Ideal for larger structures that need robust stability. Won’t degrade in water and has a smooth surface that won’t snag fins or tails.
PLA — Perfect for smaller accessories. Strong, lightweight, and fully aquarium-safe when printed and finished correctly.

At BlubberCove, we use PETG for our bigger structural caves and PLA for fine-detail accessories.

How to Pick the Right Size Cave

Small tanks: Choose compact designs that don’t block swimming space.
Large tanks: Go for multi-entry structures that offer multiple hiding zones.
Shrimp/snails: Tiny openings to keep predators out.
Larger fish: Open designs for easy entry and cleaning.

Large Aquarium Cave for Shrimp, Betta & Bottom Dwellers

Smooth, aquarium-safe PETG design — no fin or tail snags.
Two size options to suit shrimp, betta, kuhli loaches, and other bottom dwellers.
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Special Considerations for Corner Tanks

Corner caves save space and make use of awkward tank shapes while still offering depth and shelter. These are perfect if you want hiding spots without cluttering the centre of your aquascape.

Corner Aquarium or Reptile Tunnel Cave

Space-saving corner fit with open tunnel lip for easy in-out access.
Suitable for fish, shrimp, axolotls, frogs, and other small pets.
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Tips for Placing Aquarium Caves

Position caves near plants or rocks for a natural look.
Leave a clear path in and out — don’t block entry holes.
Combine different sizes to create a territory system in your tank.

FAQs

Q: Are PETG and PLA safe for aquariums?
A: Yes — when produced correctly. We use PETG for larger structures (durable, stable) and PLA for smaller accessories, and all our products are aquarium-safe.

Q: How do I clean my aquarium cave?
A: Remove it from the tank, rinse in dechlorinated water, and gently scrub with a soft brush. Avoid harsh chemicals.

Q: Can shrimp and fish share the same cave?
A: Yes, if the entrances are sized for both and there’s enough space to prevent territorial disputes.

🐚 More From BlubberCove Experts

Looking for more tips, inspiration, and expert advice for your aquarium or reptile habitat? Explore our latest guides:

BlubberCove is your trusted source for aquarium and reptile habitat tips, designs, and expert product recommendations.

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