New
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Magnetic frag rack, 3 sizes, 5 colours, 2 magnet strengths
Acclimating and growing on coral frags on the glass
From £30.99
3D printed reef tank accessories
Harry designs these 3D printed parts to make a reef tank tidier and easier to run. There are magnetic frag racks, nori and butterfly feeders, copepod pod hotels for Maxspect media, and a mount for Neptune and Red Sea gear.
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Magnets are sealed in bonded plastic capsules, and the racks and holders come in 5 colours. Harry also builds custom parts to your measurements.
Products
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Standing frag rack V2 for the tank floor, Mini or Standard
Settling new corals on the tank floor
From £16.99
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Maxspect anaerobic block holder and pod hotel V2, holds 2
Holding 2 Maxspect Nano Tech anaerobic blocks
£21.99
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Maxspect bio block holder and pod hotel V2, holds 2 blocks
Running 2 Maxspect Nano Tech bio blocks in a low profile holder
£19.99
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Maxspect bio sphere holder and copepod hotel V2, holds 1kg
Reefers running Maxspect Nano Tech bio spheres who want a pod hotel
£23.99
New
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Magnetic butterfly feeder for copperband butterflyfish
Target feeding copperband butterflyfish and other fussy eaters
From £27.99
New
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Magnetic nori feeder for tangs, Standard or Strong magnet
Tangs and other herbivores that graze on nori
From £28.99
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Black frag plugs, 25mm round or 27mm square, packs of 5 to 20
SPS frags and a low profile look in the rockwork
From £3.49
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FragDoc frag plug holder for rockwork, packs of 3, 5 or 10
Mounting frags on rockwork so they can be swapped
From £4.99
3D printed
Neptune AFS mount for Red Sea ReefLED pendant, 3D printed
Fitting a Neptune AFS inside a Red Sea ReefLED pendant
£19.99
Need something made for your tank
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Questions about 3D printed reef tank accessories
What colours do the 3D printed parts come in?
The racks and Maxspect holders come in 5 colours: Midnight Black, Scarlet Red, Aqua Green, Clown Orange and Regal Blue. Feeders, frag plugs, FragDoc and the Neptune mount do not have a colour option.
Which products in this range use magnets?
The magnetic frag rack and the 2 magnetic feeders use sealed magnets. Only those 3 are listed with magnets.
Do the magnets touch my tank water?
No. Each magnet is sealed inside a bonded plastic capsule before it is secured in the printed part. The outer magnet is made for dry use only, so it sits outside the glass.
Can Harry make a part that is not in the shop?
Yes. He designs and builds custom parts to your measurements, from frag racks to filter cups and lids. Send the details through the custom 3D printing page.
Does the Neptune mount fit every Neptune product?
No. The AFS mount is for the Neptune AFS inside a Red Sea ReefLED pendant. Check the product page for the exact fit.
Guides
15 October 2026
How to use ABC reagents, and why you recalibrate
Pre mixed ABC reagents pour straight into your existing reagent bottles. Calibrate your automated testing system after installing...
Read the guide15 October 2026
Nori clip, feeding ring or magnetic nori feeder: which should you use?
A nori clip holds 1 edge of the sheet, a feeding ring contains floating food, and a magnetic...
Read the guide15 October 2026
How to hold Maxspect bio spheres in a sump or tank
A bio sphere holder keeps 1kg of Maxspect Nano Tech bio spheres in place with water flowing through...
Read the guide
15 October 2026
Is live phytoplankton good for corals? What it does and what to expect
Live phytoplankton feeds a reef tank, but how much corals take directly is debated. Copepods and filter feeders...
Read the guide