Aquarium Stands and Cabinets: Weight, Materials, and What to Avoid

The Part That Gets Overlooked

Everyone obsesses over the tank — glass quality, overflow design, rimless or braced. Meanwhile, the thing holding up hundreds of kilograms of water, rock, and glass gets barely a second thought. Stand failures happen, and they are catastrophic.

Understanding the Weight

A 200-litre reef system weighs roughly:

Tank glass: 30–40kg
Water (200L display + 60L sump): 260kg
Live rock: 20–30kg
Sand: 15–20kg
Equipment: 5–10kg
Total: approximately 330–360kg

A 400-litre system pushes 600–700kg. That kind of load, concentrated on four legs, 24/7, in a warm humid environment, demands proper engineering.

Purpose-Built Cabinets

The safest option. Major brands sell matching cabinets:

Red Sea — marine-grade plywood, waterproof coating, around £400–800
Waterbox — aluminium frame with wood panels on some models, similar pricing
TMC — good quality, slightly lower price point

Advantages: Guaranteed weight rating, exact tank fit, waterproof interior, levelling feet, warranty coverage.

Disadvantage: Adds £400–800 to the setup cost.

DIY Stands

Viable and cost-effective, but the engineering must be right.

Steel/aluminium frame — the gold standard. Square steel tube (30mm x 30mm x 3mm wall minimum for tanks up to 300L), welded or bolted. About £50–100 in materials.

Timber frame — more common DIY approach. Minimum 50mm x 75mm uprights for smaller tanks, 50mm x 100mm for over 200L. Join with coach bolts, not just screws. Cross-brace where possible.

What NOT to use:

Flat-pack furniture (including IKEA)
MDF shelving — absorbs moisture and weakens
Glass TV stands — not rated for concentrated loads
Unbraced cinder blocks without proper mortar

Key Principles

Even weight distribution. 18mm marine-grade plywood on top, with a yoga mat or polystyrene sheet between plywood and tank
Level is critical. An unlevel tank puts uneven pressure on glass seams, causing seal failures over time
Moisture protection. Marine varnish, epoxy, or waterproof paint on all surfaces
Access. Design for sump and skimmer maintenance — doors, removable panels, or open-frame

Floor Considerations

Concrete floors: Almost always fine for any domestic aquarium.

Timber floors (upstairs): Standard UK joists support ~150kg per square metre. A large tank concentrates well above this. Position legs over joists, spread load with plywood, stay near load-bearing walls. For tanks over 200L on timber floors, a structural survey (£100–200) is worth the peace of mind.

Browse tanks and stands from UK sellers — complete tank-and-cabinet packages are often the best deals on the used market.

What stand setups are people running? Purpose-built, DIY, or something creative? DIY builds are always interesting to see.