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 Star Lava Rock
Rounded, pebble-like lava rock that is much smoother than regular lava while keeping its porous surface. You still get lots of volume per kilo and a good home for moss and bacteria.
Updated
Best for
Tanks with bettas or fancy goldfish, or anyone who wants lava's benefits without sharp edges.
What stands out
- 5, 10, 20 and 30 lb lots
- Round, smooth lava stones
- Porous surface for moss and epiphytes
- Lightweight, more pieces per pound
Models and specs
| Model | Weight |
|---|---|
| 5 lbMJBSL005 | 2.3 kg |
| 10 lbUNSH2540-10 | 4.5 kg |
| 20 lbMJBSL020 | 9.1 kg |
| 30 lbMJBSL030 | 13.6 kg |
- Brand
- UNS
- Effect on water
- Inert
- Colour
- Black to dark grey
- Texture
- Rounded, porous
- 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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Ashen Stone
Minimal or river-style scapes that want bright, soft stone against lush green planting.
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Black Lava Rock
Budget-friendly builds, nano tanks and moss-covered scapes that need plenty of stone volume.
1 model
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Black Lava Rock Cave
Shrimp and nano tanks that need hiding spots, or scapers wanting planted pockets at different heights.
4 models
Frequently asked questions
Quick answers about the UNS Black Star Lava Rock, drawn from its specs.
Does Black Star Lava Rock affect water chemistry?
Inert.
How do I prepare Black Star Lava Rock before use?
Rinse and scrub well before use
Who is the UNS Black Star Lava Rock best for?
Tanks with bettas or fancy goldfish, or anyone who wants lava's benefits without sharp edges.
What are the alternatives to the UNS Black Star Lava Rock?
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.