UNS · Stone
Ancient Stone
Iwagumi keepers who like the Manten look and want a slightly darker, more angular stone.
4 models
UNS · Stone
UNS Black Lava Rock Cave
Single pieces of black lava rock with one or more natural holes through them. Turn the opening forward for a shrimp or fish cave, or upward and fill it with soil for a little planted pocket.
Updated
Best for
Shrimp and nano tanks that need hiding spots, or scapers wanting planted pockets at different heights.
Worth knowing
Rough surface can snag long fins, and hole size and position vary between pieces.
What stands out
- Four sizes from about 15 cm to 30 cm across
- Porous lava gives grip for stacking and for moss
- Openings vary piece to piece
- Handy for nano tanks and small caves for shy fish and shrimp
Models and specs
| Model | Size |
|---|---|
| SUNSH2472-S | about 15 cm |
| MUNSH2489-M | about 20 cm |
| LUNSH2496-L | about 25 cm |
| XLUNSH2502-XL | about 30 cm |
- Brand
- UNS
- Effect on water
- Inert
- Colour
- Black to dark grey
- Texture
- Porous, rough
- Prep
- Rinse and scrub well before use
Figures from Glass Aqua's product listing. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
What lava rock does to your water
Inert, no effect on pH or hardness. As a bonus, the huge internal surface area hosts beneficial bacteria, so it doubles as biological media.
Full Lava Rock guideCompare with
Browse all hardscape
UNS · Stone
Ashen Stone
Minimal or river-style scapes that want bright, soft stone against lush green planting.
3 models
UNS · Stone
Black Lava Rock
Budget-friendly builds, nano tanks and moss-covered scapes that need plenty of stone volume.
1 model
UNS · Stone
Black Mountain Seiryu Stone
Iwagumi and nature layouts where you want Seiryu shapes in a darker, moodier colour.
3 models
Frequently asked questions
Quick answers about the UNS Black Lava Rock Cave, drawn from its specs.
Does Black Lava Rock Cave affect water chemistry?
Inert.
How do I prepare Black Lava Rock Cave before use?
Rinse and scrub well before use
Who is the UNS Black Lava Rock Cave best for?
Shrimp and nano tanks that need hiding spots, or scapers wanting planted pockets at different heights.
Is there anything to watch out for with the UNS Black Lava Rock Cave?
Rough surface can snag long fins, and hole size and position vary between pieces.
What are the alternatives to the UNS Black Lava Rock Cave?
Other hardscape worth comparing: UNS Ancient Stone, UNS Ashen Stone, UNS Black Lava Rock. Add any of them to the compare table to see the specs side by side.