Bioscape Pastel Bronze Coarse 2-4mm
Pack size
3 kg
Water type
Freshwater + Marine
Pack size
7 kg
Water type
Freshwater + Marine
Bioscape Pastel Bronze Coarse 2-4mm
A warm bronze aquarium gravel that works in fresh and saltwater. Bioscape Pastel Bronze Coarse is a 2-4 mm inert gravel in soft bronze tones, sized for a natural aquascape base under plants, fish and bottom-dwelling species. It's sold in 3 kg and 7 kg bags.
Key features
- Inert – won't shift pH or KH, so it's safe to use as a purely decorative base in any water chemistry you're already running.
- Coarse 2-4 mm grain – chunkier than Bioscape's Fine 1-2 mm grade, so it packs less tightly and lets water and root-tab nutrients move through more freely.
- Warm bronze tone – a soft, natural colour that suits both planted freshwater aquascapes and marine or brackish setups without looking artificial.
- Fresh and marine safe – the same bag works across freshwater, brackish and marine tanks.
Specifications
| Grain size | Colour | Water type | Bag sizes |
|---|---|---|---|
| Coarse, 2-4 mm | Pastel bronze | Freshwater and marine | 3 kg, 7 kg |
Which grade do I need?
| Pastel Bronze Coarse (this bag) | Pastel Bronze Fine | |
|---|---|---|
| Grain size | 2-4 mm | 1-2 mm |
| Best for | Open-bottom layouts, bottom feeders, better flow-through for root tabs | Sand-like look, corydoras and other fine-substrate species |
Suitable for, and not suitable for
Suitable for freshwater planted tanks, community aquariums, brackish setups and marine display tanks where a bronze-toned base suits the aquascape. Not intended for species that need a soft, sand-fine substrate to dig or sift through – choose the Fine 1-2 mm grade for those tanks instead.
Care and maintenance
As with any new substrate, rinse it thoroughly under running water before adding it to the tank to settle dust and fines. Being inert, it doesn't need replacing on a schedule and won't affect water chemistry over time.
Warranty and delivery
Covered against manufacturing defects under Bioscape's warranty, in addition to your rights under Australian Consumer Law. Ships by standard parcel post; the 7 kg bag is heavier freight than most decor items, so allow for that in a multi-item order.
Common questions
Will this gravel change my water chemistry?
No. Bioscape Pastel Bronze Coarse is inert and doesn't buffer pH or add hardness, so it's a purely decorative substrate choice.
Can I use it in a marine or reef tank?
Yes, Bioscape markets this gravel as safe for both freshwater and marine setups.
How much do I need for my tank?
Bioscape doesn't publish a coverage figure for this bag, so the safest approach is to buy based on your tank's footprint and desired depth, and top up with a second bag if needed – coarse gravel is easy to add to gradually.
Does it need rinsing before use?
Yes – rinse under running water until it runs clear, the same as any new aquarium substrate.
