A cozy under-gravel hideaway your fish will love
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Give your small aquatic pets a safe spot to rest and explore.
The Under-Gravel Tunnel Cave is a simple way to add comfort and fun to your aquarium decor. Made from aquarium-safe plastic, it sits neatly under the substrate and offers a natural hideout for fish like plecos, loaches, corydoras, bettas, and shrimp. Its curved dual-hole design also creates charming viewing angles so you can peek in on your fish as they relax.
Easy to place, easy to enjoy.
✔ Creates a natural hiding space
✔ Made from aquarium-safe plastic
✔ Fits neatly under gravel or sand
✔ Great for plecos, loaches, corydoras, bettas, and shrimp
✔ Adds a fun viewing spot
Dimensions are about 17.6×8.9×5.6 cm. Rinse with clean aquarium water before placing it into your tank. Avoid soaps or chemicals.
We are proud to offer duty-free, reliable, tracked shipping— delivered to your door in over 200 countries worldwide!
Below you can check our average shipping times:
Domestic USA Shipping: 2-9 business days
US & Canada: 7-18 days
Europe: 7-18 days
Europe Plus*: 8-30 days
Australia, New Zealand: 7-18 days
Hong Kong, Singapore: 7-18 days
Rest of the world: 8-30 days
*does not include processing times up to 2 business days or longer in peak periods
Primarily we ship out from fulfillment centers in the United States, Eastern Asia and Western Europe. If the item you've purchased is out of inventory in your nearest location, we'll send it directly from our production lines at the same delivery times as stated in our shipping section.
Is this tunnel safe for all aquarium fish?
Yes, it is made from aquarium-safe plastic and works well for small fish and shrimp that enjoy hiding spots.
Does it stay down under the gravel?
Yes, it sinks naturally and stays in place once covered with your chosen substrate.
Will my fish use both openings?
Most small fish and shrimp enjoy exploring both holes, which helps them feel secure and gives you a fun way to watch them.
Helps your fish feel safe by giving them a calm place to relax under the gravel.
Reduces stress for shy fish and shrimp that like to hide during the day.
Just shift your substrate, place the tunnel, and cover the edges.
The curved dual-hole shape lets you peek inside as your fish explore.
Fits naturally into most aquascaping styles without distracting from your layout.
A simple hiding spot that feels natural to your fish
| Features | MK Aquarium | Knock-Offs |
|---|---|---|
| Aquarium-safe materials | ||
| Curved dual-hole viewing design | ||
| Stable under-gravel placement | ||
| Made for small fish and shrimp | ||
| Natural blending with substrate | ||
| Simple installation | ||
| Lightweight but sturdy | ||
| Smooth fish-friendly edges | ||
| Low-maintenance care |
Move a bit of gravel or sand aside, place the tunnel against the glass, and cover the edges until it sits naturally.
Yes, the compact size fits most tanks and adds comfort without taking much space.
Yes, the openings are smooth and gentle, making it a safe hideout for shrimp and other small tank mates.
No, it sinks on its own and stays put once surrounded by substrate.
Yes, it works well under both sand and gravel setups.
Rinse it with tank water during routine maintenance to remove light debris.
No, it is made from aquarium-safe plastic that won’t release anything into your water.
Not usually; the open ends allow gentle flow while still giving fish a cozy place to rest.
Yes, its simple shape blends easily into many layouts and makes a great base for creative scapes.
