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
Classic porous black lava rock, sold in a 15 to 16 lb lot. It is light, so you get a lot of volume per kilo, and the rough surface is one of the easiest for moss and epiphytes to grab.
Updated
Best for
Budget-friendly builds, nano tanks and moss-covered scapes that need plenty of stone volume.
Worth knowing
Rough edges can catch long fins, and it holds debris, so rinse it thoroughly first.
What stands out
- 15-16 lb (about 7 kg) per order
- Very porous, lightweight rock
- Excellent for moss, Anubias, Bucephalandra and ferns
- Easy to break into smaller pieces
Specs
| Model | Weight |
|---|---|
| 15-16 lb boxBLR0013 | 7 kg |
- Brand
- UNS
- Effect on water
- Inert
- Colour
- Black to charcoal
- Texture
- Very 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
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UNS · Stone
Ashen Stone
Minimal or river-style scapes that want bright, soft stone against lush green planting.
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Black Lava Rock Cave
Shrimp and nano tanks that need hiding spots, or scapers wanting planted pockets at different heights.
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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, drawn from its specs.
Does Black Lava Rock affect water chemistry?
Inert.
How do I prepare Black Lava Rock before use?
Rinse and scrub well before use
Who is the UNS Black Lava Rock best for?
Budget-friendly builds, nano tanks and moss-covered scapes that need plenty of stone volume.
Is there anything to watch out for with the UNS Black Lava Rock?
Rough edges can catch long fins, and it holds debris, so rinse it thoroughly first.
What are the alternatives to the UNS Black Lava Rock?
Other hardscape worth comparing: UNS Ancient Stone, UNS Ashen Stone, UNS Black Lava Rock Cave. Add any of them to the compare table to see the specs side by side.