After a busy frag swap, or a run of successful cuts, the frags start to pile up quickly, and without a proper system to hold them, they end up scattered across the sandbed, tucked against rocks, or worse, touching each other and causing aggression before they have even had a chance to establish. Managing a growing frag collection without a dedicated holding structure is one of those problems that feels minor until it costs you a piece you were genuinely excited about.

The result is frags that fail not from poor husbandry but from poor organisation, inadequate flow because a plug fell sideways, tissue damage from proximity, or frags simply going missing in a tank that has no logical system for staging new arrivals.The Reefphyto Coral Frag Rack Hex Stand holds 13 standard frag plugs in a compact hexagonal formation, keeping each frag spaced, upright, and correctly positioned for light and flow. Printed from reef-safe PETG at our Welsh facility, it is freestanding and can be placed anywhere in the aquarium or frag tank, on the sandbed, on rockwork, or on the bare bottom of a sump. Available in black or white at £5.95.

With 13 frags held in clean formation, each one gets consistent light penetration and unobstructed flow. You can see at a glance what you have growing, move the entire rack for maintenance without disturbing individual plugs, and stage new arrivals without disrupting the rest of the tank.

We design and print every tool in our 3D reef tools range in-house in Wales, with the same attention to detail we bring to our live cultures. Darren is available directly if you have questions about frag management, grow-out positioning, or building a coral propagation setup that works for your system.

Put your frag collection in order and give every piece the space it needs to grow.

Growing a frag collection is one of the genuinely rewarding parts of reef keeping. Watching a small cut of an SPS or LPS coral establish, encrust, and develop into a healthy colony over weeks and months is satisfying in a way that buying a fully grown piece never quite matches. But a frag collection that grows faster than your organisation system can handle becomes a problem. Plugs on the sandbed, frags too close together, poor positioning for light, these are the situations that cause unnecessary losses and turn an enjoyable part of the hobby into a management headache.

The Reefphyto Coral Frag Rack Hex Stand is designed to solve that problem with a single, well-made piece of equipment. Thirteen plug positions in a hexagonal arrangement, printed from reef-safe PETG, freestanding, and available at a price that makes equipping an entire frag tank practical rather than expensive.

What the Hexagonal Design Actually Does for Your Frags

The hexagonal format is not purely aesthetic. A hex arrangement spaces 13 plug positions in a formation that maximises the number of frags held within a compact footprint while keeping each plug separated from its neighbours. This matters for several reasons.

Coral frags placed too close together will sweep against each other as polyps extend, particularly LPS species with longer tentacles. This contact triggers chemical stress responses and, in some cases, alleukogenic sweeper tentacle deployment, a defensive reaction that can cause tissue damage on adjacent frags overnight. The spacing built into the hex rack keeps each frag within its own zone without the rack needing to take up disproportionate space in the tank.

The elevated position of each plug also allows water movement to reach the coral from multiple directions, which is particularly beneficial during the establishment phase when the coral is investing energy in encrusting the plug surface. Good flow carries away metabolic waste, delivers oxygen, and supports the behaviour of polyp extension that signals a frag has settled.

Specifications and Materials

The Hex Stand holds 13 standard frag plugs and is freestanding, requiring no attachment to glass, rockwork, or any other surface. It can be placed directly on the sandbed, on a flat rock shelf, or on the bare bottom of a dedicated frag tank or sump.

Printed from reef-safe PETG at the Reefphyto facility in Wales. PETG is the same material used across the full Reefphyto 3D reef tools range, non-toxic, saltwater resistant, and dimensionally stable in the marine environment over extended periods. It does not leach plasticisers, does not degrade under aquarium lighting, and cleans easily between uses.

Available in black or white. £5.95.

Who Uses the Hex Frag Rack

The hex rack is well suited to any keeper who is actively propagating corals, receiving frags regularly, or running a dedicated frag tank alongside a display system. It provides a practical staging area for new arrivals, a single location where frags can be monitored during the first weeks, positioned for optimal light and flow, and assessed for health before being moved to a permanent location in the display.

For keepers who participate in frag swaps, the rack provides a clean, organised holding system for incoming pieces that makes it immediately clear what is in the system, at what stage of establishment, and where it is positioned. This is the kind of practical organisation that makes a real difference when managing multiple species with different lighting and flow requirements.

The rack is also useful in commercial grow-out operations and public aquarium settings where multiple frags need to be staged, labelled, and monitored at the same time.

Using the Hex Rack Alongside Other Reefphyto 3D Tools

The hex rack sits naturally alongside the other products in the Reefphyto 3D reef tools range. For individual frags that need to be held on the sandbed rather than in a group rack, the Coral Frag Rack Stand provides a single-plug sandbed solution with a wide base for stability. For frags being grown on a flat tile or disc surface rather than on plugs, the Coral Grow Out Disc provides a textured PETG mounting surface. For copepod population management in the same system, the PodHide range provides structured habitat that copepods will colonise naturally, a consideration worth making if the frag tank is also being used to maintain a live food population for finicky feeders in the display.

Each product in the range addresses a specific practical need, and they can be combined in the same system without conflict.

Placement and Care

Place the hex rack on any flat surface within the aquarium. Position it so that the dominant flow direction is not blocked by rockwork, the goal is for water movement to reach the plugs from the front or side of the rack rather than being deflected away from it. In frag tanks with powerheads on a wavemaker, the hex formation means that flow reaches different plug positions from different directions throughout the wave cycle, which is generally beneficial.

The rack can be cleaned between uses by removing plugs and soaking in a freshwater dip or scrubbing with a soft brush to remove coralline algae and encrustation. PETG is robust enough to handle this without cracking or deforming.

Frequently Asked Questions

What size frag plugs does the hex rack hold? The rack is designed for standard frag plugs. If you are unsure whether your plug size is compatible, contact us before ordering and we can confirm fit.

Can I use it in a high-flow frag tank? Yes. The freestanding design is stable under normal aquarium flow. In very high flow situations, placing the rack against a flat surface or weighting the base with a small rock can add additional stability if needed.

Is it suitable for use with LPS corals? Yes, though be mindful of tentacle extension on larger LPS species, leave adjacent plug positions empty if you are placing LPS frags with particularly long sweeper tentacles.

Can it be used in a sump? Yes. The rack works on any flat surface, including the bare bottom of a sump or refugium. It can double as a temporary holding location for frags being quarantined before introduction to the display.

Does it float? No. PETG is denser than water and the rack will sit on the bottom surface without anchoring.

3D Reef Tools, Designed and Printed in Wales

The Coral Frag Rack Hex Stand is part of the Reefphyto 3D reef tools range, designed and printed in-house at our Welsh facility. Every piece in the range is produced with the same care we bring to our live cultures, practical, reef-safe, and built to solve real problems that reef keepers face. If you have questions about the hex rack, frag management, or how to build a coral propagation system that works for the species you keep, contact us directly. Darren is available personally and is glad to help keepers at every stage of experience.