Description
Mantis Bio Sphere – 1kg — pH-neutral ceramic bio-media beads for canister and HOB filters
A canister or hang-on-back filter has a small media basket, and what goes in it decides how much of the tank’s ammonia and nitrite actually gets processed. Mantis Bio Sphere – 1kg (SKU: MA069702) is a pH-neutral ceramic bio-media in bead form, built with an open flow structure and an ultra-high surface area so a modest volume of beads carries a disproportionately large bacterial colony. The ceramic is inert and does not shift the water chemistry, which is what the pH-neutral description refers to, so it can be dropped into an established tank without affecting existing parameters. The 1 kg bag suits a single canister filter, a hang-on-back basket, or topping up a small to medium sump.
The beads are designed for sumps, trickle filters, wet/dry towers, hang-on-back filters, or scattered directly in the aquarium, and the same bag works across freshwater, marine and pond systems. A microporous surface gives the beads their high specific surface area, which is where the biofilm of nitrifying bacteria actually forms rather than on the smooth outer shell alone. Because they are loose beads rather than a solid block, they pack into an awkward-shaped basket or chamber more easily than a block media, filling gaps around pumps, heaters or intake strainers. A 2 kg bag (SKU: MA069703) is stocked for larger sumps or where two filters are being seeded at once, and the beads from either size are interchangeable and can be mixed in the same chamber.
Usage & Application
When to Use
- Canister and HOB filters: Filling a media basket where loose beads pack more easily than a fixed block.
- Small to medium sumps: A 1 kg bag sized for a single sump tray or filter sock holder.
- New tank cycling: Adding surface area early so a biofilm has somewhere to establish.
- Freshwater, marine or pond: The same bead suits any of the three water types.
Placement & Usage Guide
- Rinse before loading: Run the beads under tap water to remove dust before placing them in the filter.
- Use a media bag or basket: Contain loose beads so they stay in the flow path rather than scattering through the filter.
- Position in the flow: Pack them where water is forced through the media, not around a bypassed corner.
- Avoid over-cleaning: Rinse gently in old tank water rather than scrubbing or replacing the whole batch at once.
Product Specifications & Highlights
Key Features
- pH-neutral ceramic: Inert beads that add bacterial surface without shifting water chemistry.
- Ultra-high surface area: A microporous structure that carries far more biofilm than solid media of the same volume.
- Loose bead format: Packs into odd-shaped baskets and chambers more readily than a block.
- 1 kg bag size: Suited to a single canister, HOB filter or small sump.
- Freshwater, marine and pond use: One media across every common water type.
Product Details
- Brand: Mantis
- SKU: MA069702
- Product Type: Filter Media > Ceramic Biological Media (Spheres)
- Net Weight: 1 kg
- Material: pH-neutral, microporous ceramic beads
- Suitable Filters: Sumps, trickle/wet-dry towers, hang-on-back filters, canisters, or placed directly in the aquarium
- Other Sizes: Mantis Bio Sphere 2 kg (SKU: MA069703)
- Target Environment: Freshwater, marine and pond aquariums


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