Waterbox
Waterbox Cube 20 (AIO)
Gear matched to this tank: lights by coral goal, skimmers and pumps checked against its rear chamber.
Best lights (by coral goal)
Kessil Kessil A160WE Tuna Blue
Medium
$259.00
- covers 17.7×15" display area
- LPS/mixed intensity meets your LPS goal
Nicrew Nicrew HyperReef 50 (Gen 2)
Medium
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- covers 17.7×15" display area
- LPS/mixed intensity meets your LPS goal
Aqua Illumination AI Prime 16HD Reef
High
$264.99
- covers 17.7×15" display area
- SPS-capable intensity meets your LPS goal
Reef Breeders Reef Breeders Reef Nano LED
High
$169.99
- covers 17.7×15" display area
- SPS-capable intensity meets your LPS goal
Compare all lights ranked for the Waterbox Cube 20 (AIO) →
Best protein skimmers (sized for medium bioload)
in-chamber
$98.16
- rated to 30g, covers your 30g medium-bioload target (tank + margin)
- 3.2×2.75" footprint fits the 7.9×3.1" rear chamber
in-chamber
$149.99
- rated to 37g, covers your 30g medium-bioload target (tank + margin)
- 4.33×2.48" footprint fits the 7.9×3.1" rear chamber
HOB
$189.99
- rated to 75g, covers your 30g medium-bioload target (tank + margin)
- hangs on back — no chamber-fit constraint
HOB
$334.94
- rated to 105g, covers your 30g medium-bioload target (tank + margin)
- hangs on back — no chamber-fit constraint
- built for much larger systems (105g) — likely oversized for a nano
Compare all skimmers ranked for the Waterbox Cube 20 (AIO) →
Best return pumps (for ~5× display turnover)
AC
$34.99
- ~83 gph at the tank ≈ 4.1× display turnover
- 2.3×1.7" footprint fits the 7.9×3.1" rear chamber
AC
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- ~119 gph at the tank ≈ 6.0× display turnover
- 2.44×1.5" footprint fits the 7.9×3.1" rear chamber
AC
$54.99
- ~158 gph at the tank ≈ 7.9× display turnover
- 3.4×1.88" footprint fits the 7.9×3.1" rear chamber
DC
$146.00
- DC pump — dial flow to taste
- 3.7×2.5" footprint fits the 7.9×3.1" rear chamber
- strong: ~12.2× turnover — fine if controllable/throttled
Compare all return pumps ranked for the Waterbox Cube 20 (AIO) →
Tank specs
| Display volume | 20 gal |
| Total water volume | 20 gal |
| Outer dimensions (L×W×H) | 17.7 × 17.7 × 15.7 in |
| Rear chamber (W×D×H) | 7.9 × 3.1 × 15.7 in (mfr) |
| Stock return pump | 264 gph |
| Stock light | none |
Largest usable rear chamber 7.9 x 3.1 x 15.7in (retailer-published mfr spec). Includes a matched return pump; GPH not published by Waterbox, community identifies a ~264 GPH pump. Usable height ~15.2in after rim.