Is the Reef 4.0 enough light for SPS corals?

Usually not. At 22W it suits soft corals and LPS in shallow nano tanks. Most owners step up to a larger fixture for demanding SPS.

Can I use it without a phone?

No. The light is controlled only through the FluvalConnect app, with no dials or buttons on the fixture. You need the app for schedules and channel changes.

What tank sizes does it fit?

The extendable brackets cover tanks about 15 to 24 inches wide. Larger tanks need a bigger model or a second unit.

Does it come with a hanging kit?

No. The box has the light, power supply and extendable riser brackets. A suspension kit is sold separately if you want to hang it.

Is it safe over an open-top tank?

It is rated IP67 for water and dust, so splashes from maintenance or fish are not an immediate problem. It is not meant to be submerged.

How many channels can I adjust?

Seven color channels can be set independently, so you can tune the blue-to-white balance and save it into a 24-hour schedule.

Where can I buy the Fluval Reef 4.0 LED for Marine & Reef Aquariums?

2 stores we checked sell it, including Amazon, Phil's Pets.

Fluval Reef 4.0 LED for Marine & Reef Aquariums

Q: Where is the Fluval Reef 4.0 LED for Marine & Reef Aquariums cheapest?

At Phil's Pets, for $120.00, as of our latest check.

Best price now

$120.00at Phil's PetsChecked Nov 9

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Phil's Pets

What reviewers say

Owners of small reef tanks generally rate the Reef 4.0 well for color pop, quiet running and easy scheduling, and call it good value for soft corals and LPS. The recurring complaints are the app-only control and modest output on deeper tanks.

What people mention

App controlMixedOwners like the scheduling but dislike that the light has no onboard buttons and depends on the phone app.
ColorPraisedReviewers say the actinic channels bring out coral fluorescence and let them dial in a look they like.
OutputCriticisedSome keepers find 22W short on deeper tanks and say it suits soft corals and LPS better than demanding SPS.
NoisePraisedOwners report the fixture runs quietly with no fan noise in the room.
MountingMixedThe riser brackets are seen as solid, but hanging the light needs a separate suspension kit.

About the Fluval Reef 4.0 LED for Marine & Reef Aquariums

The Reef 4.0 LED isn't just lighting – it's the key to a thriving saltwater aquarium. With a full spectrum that includes the critical actinic range, it fuels peak coral photosynthesis to bring out their optimal color, growth and health potential. Plus, exclusive FluvalConnect mobile app control offers complete customization and added convenience.

Key Features:

• Powerful full spectrum lighting for maximum coral growth, color and health

• 7 customizable, independently controlled color channels

• Operated exclusively via the FluvalConnect mobile app

• Programmable 24-hour light cycle adjust sunrise, mid-day, dusk, and night settings to mimic natural sun and moon cycles

• Preset environments select from several convenient aquarium profiles

• IP67 advanced water and dust ingress protection

• Aluminum alloy frame dissipates heat evenly to improve lighting efficiency and longevity

• Extendable brackets accommodate a range of aquarium widths for on-tank mounting

• Riser brackets allow adjustable vertical positioning (included)

• Optional suspension kit sold separately (Item #14573)

• Engineered in Germany