Stop letting your bio-spheres and bio-balls roll around your sump doing half a job. Our Marine-Safe PETG Bio-Ball Holder is purpose-built for Maxspect and Mantis bio-spheres, with a 4x3 peg grid that holds 12 pieces securely in place while maximising water contact and biological filtration surface area.
Why You'll Love It
Maxspect & Mantis Compatible — Designed to a precise 4x3 peg layout to seat bio-spheres and bio-balls firmly with no movement or stacking
Marine-Safe PETG — Printed in food-grade, reef-safe PETG that won’t leach harmful chemicals or affect your water parameters, corals, or livestock
Maximum Flow-Through Design — Open peg structure promotes unrestricted water flow around every piece of media for peak biological filtration efficiency
Keeps Your Sump Tidy — No more loose media migrating around your filter chamber — everything stays exactly where it should
Made in the UK — 3D printed to order by S&K 3D Printing Ltd, crafted for reef keepers who demand precision
Who Is It For?
Whether you're running a dedicated reef system, an SPS tank, or a high-bioload FOWLR setup — if you're using Maxspect or Mantis bio-spheres, this holder will bring order to your biological filtration and help it perform at its best.
Pair it with our Maxspect Bio Block Holder for a fully organised, high-performance sump setup.
Printed to order in the UK — because your reef deserves precision engineering.
