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Fiji Cube 81 Gallon Internal Overflow Rimless AquariumFiji Cube
Reef aquarium

81 Gallon INT-M

by Fiji Cube

A taller, standard-depth rimless tank from Fiji Cube (not part of the Shallow line) with a slim internal-middle overflow box built into the glass — bare tank only, no stand or sump included.

Mid-rangePackageDrilled
Net volume
84 gal (319 L)
Dimensions
36"×24"×23"
Glass
12 mm
Drilled
Yes
est. from$1,160
Package includes
Filtration
Overflow box
Plumbing

Items included with the tank. Sump fit is treated as auto-pass when building with a package tank.

The full sheet — every number we check a build against.

Dimensions
L × W × H
36"×24"×23"
Volume
Net (display) volume
84 gal (319 L)
Gross volume
84 gal (319 L)
Glass
Thickness
12 mm
Filtration
Drilled
Yes
Sump compatible
Yes
What this tank locks in

Volume drives skimmer rating, return-pump turnover, and light footprint. Picking this tank sets a target of:

≈660 gph
turnover
rated for 125 gal
skimmer rating
covers a 36.0" footprint
lighting footprint

We'll check every part you add against these targets.

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Frequently asked

What are the key specs of the Fiji Cube 81 Gallon INT-M?

Net volume: 84 gal (319 L). Dimensions: 36"×24"×23". Glass: 12 mm. Drilled: Yes.

How much does the Fiji Cube 81 Gallon INT-M cost?

The Fiji Cube 81 Gallon INT-M starts around $1,160, though prices vary by retailer — see current offers on this page.

What equipment do I need for the Fiji Cube 81 Gallon INT-M?

Based on its volume and footprint, the Fiji Cube 81 Gallon INT-M calls for a return pump rated ≈660 gph, a skimmer rated for 125 gal, lighting that covers a 36.0" footprint. Add it to a build on ReefPicker to see every matching part checked against it.