Fluval Flex 9 (34L)
Gear matched to this tank: lights by coral goal, skimmers and pumps checked against its rear chamber.
Best lights (by coral goal)
- covers 14×11" display area
- LPS/mixed intensity meets your LPS goal
- covers 14×11" display area
- LPS/mixed intensity meets your LPS goal
- covers 14×11" display area
- LPS/mixed intensity meets your LPS goal
- covers 14×11" display area
- SPS-capable intensity meets your LPS goal
- covers 14×11" display area
- SPS-capable intensity meets your LPS goal
Compare all lights ranked for the Fluval Flex 9 (34L) →
Best protein skimmers (sized for medium bioload)
- rated to 25g, covers your 14g medium-bioload target (tank + margin)
- hangs on back — no chamber-fit constraint
- rated to 75g, covers your 14g medium-bioload target (tank + margin)
- hangs on back — no chamber-fit constraint
- built for much larger systems (75g) — likely oversized for a nano
- rated to 105g, covers your 14g medium-bioload target (tank + margin)
- hangs on back — no chamber-fit constraint
- built for much larger systems (105g) — likely oversized for a nano
- rated to 20g, covers your 14g medium-bioload target (tank + margin)
- 3.58×2.28" footprint may not fit the ~3.875×2.125" chamber (community dims — verify)
Compare all skimmers ranked for the Fluval Flex 9 (34L) →
Best return pumps (for ~5× display turnover)
- DC pump — dial flow to taste
- strong: ~32.6× turnover — fine if controllable/throttled
- 3.7×2.5" footprint may not fit the ~3.875×2.125" chamber (community dims — verify)
- DC pump — dial flow to taste
- strong: ~53.8× turnover — fine if controllable/throttled
- 4.4×2.6" footprint may not fit the ~3.875×2.125" chamber (community dims — verify)
- DC pump — dial flow to taste
- strong: ~79.2× turnover — fine if controllable/throttled
- 5.1×3.1" footprint may not fit the ~3.875×2.125" chamber (community dims — verify)
Compare all return pumps ranked for the Fluval Flex 9 (34L) →
Heaters
Best heaters for the Fluval Flex 9 (34L), checked against its rear chamber →
Tank specs
| Display volume | 7.5 gal |
| Total water volume | 9 gal |
| Outer dimensions (L×W×H) | 14 × 13.4 × 13 in |
| Rear chamber (W×D×H) | 3.875 × 2.125 × 11.375 in (community) |
| Stock return pump | 92 gph |
| Stock light | Integrated 7500K white + RGB LED (~5.26W), FLEXPad remote |
Outer dims are the bounding box; the curved front glass makes the usable footprint shallower at the corners than 13.4 in implies. Chamber values are not published by Fluval; derived from the inTank Chamber One media basket (3-7/8 W x 2-1/8 D x 11-3/8 H), so D (~2.1 in) is a conservative front-to-back constraint and the molded chamber is slightly larger. Stock return ~92 GPH (348 L/h) per BRS/Fluval spec table.