Maxspect / Mantis Bio-Sphere Bio-Ball Holder (3x3 Pegs) - Marine Safe PETG 3D Printed

Compact Filtration, Zero Compromise

Perfect for smaller sumps, nano setups, or wherever space is at a premium — our 3x3 Marine-Safe PETG Bio-Ball Holder holds 9 Maxspect or Mantis bio-spheres securely in place, keeping your biological filtration working hard and your filter chamber looking clean.

Why You'll Love It

• Maxspect & Mantis Compatible — Precision 3x3 peg layout designed to seat bio-spheres and bio-balls snugly with no shifting or stacking
• Marine-Safe PETG — Printed in food-grade, reef-safe PETG that won’t leach chemicals or affect your water parameters, corals, or livestock
• Flow-Optimised Design — Open peg structure allows unrestricted water flow around all 9 pieces of media for maximum biological efficiency
• Compact Footprint — The 3x3 layout is ideal for nano reefs, smaller sumps, or when you want to run multiple holders side by side
• Made in the UK — 3D printed to order by S&K 3D Printing Ltd with reef keepers in mind

Mix & Match Your Setup

Running a larger system? Combine multiple 3x3 holders to fill your filter chamber exactly as you need, or pair with our 4x3 Bio-Ball Holder and Bio Block Holder for a fully customised, high-performance sump.

Printed to order in the UK — small footprint, big results.