Black lava rock, 3/4 inch

Black lava rock, 3/4 inch, washed and screened and sold in 1 lb and 5 lb bags. This larger nominal grade gives a different visible scale from our 3/8 inch material. A bag weight does not guarantee a fixed piece count or a collection of identical shapes.

Plan a visible arrangement from the actual support points. Keep heavy or leaning pieces stable when loose ground moves, and follow the aquarium maker's load guidance. Leave room next to glass, intakes, and heaters. A tightly packed display is difficult to maintain if every service task begins by disturbing the hardscape.

Look at gaps as carefully as the stone surfaces. Animals may enter behind or beneath a piece from a direction you did not intend. Consider adult size and normal movement, and avoid narrow passages that cannot be inspected. The nominal grade alone cannot establish swallowing or abrasion safety.

For filter use, confirm that the equipment allows loose stone and that its retaining system holds actual fragments. Filling more space does not automatically create a mature biological filter. Water movement, oxygen, solids management, and establishment belong to the complete system.

Water chemistry is unconfirmed for this material. We do not infer inertness from color, volcanic appearance, or a negative household-vinegar observation. Choose an aquatic use only when the relevant information is established for the actual batch.

Rinse off handling fines before appropriate use. Compare the estimated volume with the bag mix and separate shipping total. Representative wet and dry views illustrate texture and light; they do not show measured pieces from your bag or certify a particular water-habitat use.