Blubber Cove XL Aquarium Cave – Standalone Centrepiece Tunnel for Large Tanks

The Blubber Cove XL Aquarium Cave is the biggest cave in our range — a freestanding centrepiece tunnel designed to sit in the middle of large tanks rather than tucked into a corner. At 234mm wide on the Large size, it's built for tanks from 150 litres up where corner caves get lost and standard hides look undersized. The curved arch shape creates a dramatic visual anchor for your aquascape while giving plecos, corydoras and community fish a proper enclosed retreat. UK 3D-printed in aquarium-safe PETG.

Why a standalone centrepiece?

Most aquarium caves are designed for corners — they hide in the dead space against the back glass. That works for small and medium tanks, but in a 150-litre+ setup, a corner cave disappears. Large tanks need a centrepiece: a feature that anchors the aquascape, draws the eye, and gives fish a proper destination to swim toward. Place it dead centre, on a sand bank, or surrounded by driftwood — and let it be the focal point your tank deserves.

Features

• XL footprint — biggest cave in our range, built for tanks 150 litres and up
• Standalone centrepiece shape — designed to be a tank focal point, not a corner accessory
• Curved arch tunnel — wide opening for adult plecos, large catfish, big community fish
• Substrate-friendly base — sit visible, partially bury, or fully bury for an underground effect
• Smooth interior — safe for delicate fins and shrimp moults
• 3D-printed in Northumberland, UK from aquarium-safe PETG
• Wide enough for shoaling species to retreat as a group

Specifications

• Material: Aquarium-safe PETG plastic
• Standard size: 190 × 121 × 78 mm (60 mm opening)
• Large (XL) size: 234 × 150 × 97 mm (81 mm opening)
• Placement: Standalone — centre of tank, not corner-fitted
• Tank size: Standard suits 60L+ · Large XL suits 150L+
• Colours: Black, White, Marble Effect, Moss Green, Sand
• Made in: Northumberland, United Kingdom
• Brand: Blubber Cove

Suitable species

• Adult bristlenose plecos, common plecos, sailfin plecos
• Large catfish — synodontis, twig catfish, clown loaches
• Corydoras shoals (the XL fits a group together)
• Cichlids — apistogramma, kribensis, electric blue acara, severums
• Angelfish and discus (community refuges)
• Neocaridina and Caridina shrimp colonies

Choosing the right size

• Standard (190 × 121 × 78 mm): medium tanks 60–150 litres, larger community setups, multiple plecos
• Large XL (234 × 150 × 97 mm): large tanks 150L+, adult plecos, big community setups, monster-tank centrepieces

How is this different from your other Blubber Cove caves?

Two things — placement and size. This is our only standalone centrepiece cave (every other cave in our range is corner-fitted or foreground-placed). And the Large XL variant is the biggest cave we make — designed specifically for tanks where smaller caves look out of scale.

Aquascape placement ideas

• Dead centre: primary focal point with plants radiating outward
• Sand bank centrepiece: place on a raised sand mound for elevated drama
• Driftwood pairing: flank with driftwood branches to extend the silhouette
• Partial burial: bury one side under substrate for an asymmetric natural look
• Full burial: cover entirely with substrate for an invisible underground tunnel

Frequently asked questions

Will it dominate my tank visually?

That's the point. In a 150L+ tank, you want a clear centrepiece. The arch shape is dramatic but not noisy — it reads as a natural rock formation rather than a moulded ornament. If you want something subtler, our Arch Bridge Corner Cave is the refined version.

Will my pleco fit through the entrance?

On the Large XL, yes — the 81mm opening fits adult bristlenose plecos and most common plecos. For very large sailfin or common plecos approaching 30cm body length, measure first.

Can I bury it in substrate?

Yes — fully or partially. The shape works in three modes: fully visible centrepiece, half-buried for asymmetric naturalism, or fully buried as an underground tunnel where only the entrance shows.

Will it work in a smaller tank?

The Standard size (190mm wide) works in 60-litre tanks and up. The Large XL needs 150L+ to look proportionate — in smaller tanks it dominates more than it should.

Is it safe for shrimp colonies?

Yes. PETG is shrimp-safe (no copper, no leaching). The XL size is particularly good for large colonies because multiple shrimp can graze the interior surfaces without competing.

Will it work for cichlids?

Yes — the enclosed shape suits cave-spawners like apistogramma, kribensis and electric blue acara. The XL size makes a proper breeding territory.

Why buy from Blubber Cove

Original aquascaper-designed pieces, 3D-printed to order in our Northumberland workshop in aquarium-safe PETG. The XL Centrepiece is the flagship of our cave range. Free UK delivery over £30.