80 Gallon Fish Tank Dimensions Guide: Standard Sizes

Before you commission glass or commit a corner of the living room, nail down the footprint. This 80 gallon fish tank dimensions guide (303 L) covers standard rectangular, long, tall and cube variants as sold by Singapore fabricators and commonly imported brands. At Gensou Aquascaping, 5 Everton Park, we walk every client through lift access, door width and wall clearance before they even pick a species — the cheapest mistake in a large-tank build is a tank that physically cannot reach the room.

Standard 80 Gallon Footprint

The most common 80-gallon rectangular measures 48 x 18 x 21 in (122 x 46 x 53 cm). This footprint mirrors the US “80 long” format and clears most HDB doorways at 80-85 cm wide. Filled weight sits around 380-420 kg including substrate and rockwork, which lands well within a typical HDB 50 psf live load when the stand spans multiple joists.

80 Long Variant

Some retailers sell an “80 long” at 60 x 16 x 16 in (152 x 41 x 41 cm), prized by aquascapers for its shallow profile and stretched aquascape sightline. The shallower height simplifies planting and lighting, but the longer glass needs a stand at least 155 cm wide — measure your wall run carefully, especially in HDB flats with power sockets at typical 120-140 cm intervals.

Tall Variants and Cubes

Tall 80-gallon builds push the height to 24-30 in (61-76 cm), trading aquascape ease for dramatic vertical display. Cube-style 80 gallons measure around 36 x 24 x 22 in (91 x 61 x 56 cm) — an excellent format for angelfish or discus, and the wider footprint reduces floor pressure per square inch. Cubes are almost always custom-built locally at SGD 620-780 by Qian Hu or East Ocean.

Glass Thickness and Rimless Options

Standard 80-gallon tanks use 10 mm float glass; starphire (low-iron) adds SGD 180-260 to the bill but visibly removes the green tint on the front pane. Rimless ADA-style builds require 12 mm glass minimum for safety margin. Verify bracing — a 48 in rimless with no top brace needs euro-bracing or 12 mm glass; sellers cutting corners at 8 mm unbraced have failed in Singapore’s temperature-cycled aircon rooms.

Weight, Floor Load and HDB Considerations

A filled 80-gallon runs 380-420 kg. Divide by the stand footprint (roughly 0.56 m²) and you get around 750 kg/m² concentrated load — under HDB’s 244 kg/m² (50 psf) live load allowance when spread across a properly built cabinet. Problems only arise with narrow pedestal stands, raised platforms or parquet over screed. For condos with screed floors and landed homes on slabs, 80 gallons is effectively plug-and-play.

Lift Access and Door Clearance

A 122 cm rectangular clears most HDB passenger lifts diagonally but service lifts make delivery painless. Measure your lift’s interior diagonal — most HDB lifts manage 140 cm diagonally. Landed homes need 80 cm doorway clearance minimum; condos with service lobbies rarely have issues. Qian Hu’s delivery team will decline jobs where access is unclear, so photograph the route before confirming.

Stand Dimensions and Cabinet Fit

Match the stand to the tank footprint with zero overhang — glass bottoms require full perimeter support unless the tank uses starphire with a foam mat. Typical 80-gallon cabinets run 122 x 50 x 80 cm at SGD 450-650 from Polyart or Anchor. Leave 10 cm rear clearance for hoses, and 20 cm overhead for filter servicing and lighting rails.

Aquascape Implications of Different Dimensions

Standard 48 x 18 x 21 suits iwagumi, triangular and island scapes. Long 60 x 16 x 16 format excels at diorama and forest scapes with long sightlines. Tall builds favour cloud-forest dioramas with tall stem plants. Cubes work brilliantly for biotope aquascapes where depth supports layered planting. Pick the format that matches your vision, not the most common shape.

Custom Build Pricing in Singapore

Local fabricators quote 80-gallon builds as follows: Qian Hu standard 10 mm float at SGD 420-480, starphire upgrade SGD 600-680, rimless 12 mm starphire SGD 780-920. East Ocean runs slightly cheaper at SGD 380-620 depending on silicone finish. Factor SGD 120-180 for delivery with stand setup. Add SGD 80-120 for bottom bracing or euro-brace strips if you plan a heavy rockwork scape.

International Brands Sold Locally

ADA does not stock an exact 80-gallon but their 120-P (120 x 50 x 50 cm, 300 L) is the closest match at SGD 1,280-1,480 from Nature Aquarium Gallery. Waterbox and Ultum Nature Systems occasionally appear on Carousell at SGD 900-1,400 used; verify silicone condition and bracing before buying. For shipped imports, factor GST and freight — a USD 600 tank lands around SGD 1,100 all-in.

Related Reading

• Fish Tank Setup Guide
• Aquarium Stand Buying Guide Singapore
• HDB Aquarium Floor Load Guide
• Rimless Aquarium Guide
• Custom Aquarium Singapore Guide