3-in-1 Seaweed Scraper 18" — Metal, Plastic & Retractable Soft Pad | Seachem

The Seachem 3-in-1 Algae Scraper 18" (46 cm) is the longest model in the range, designed for large reef and deep aquariums. Equipped with three included interchangeable retractable blades—metal, plastic, and a soft pad—it allows you to clean the entire glass surface without getting your arm wet. Lightweight, ergonomic, and buoyant for easy retrieval if dropped in the water.

Main advantages

• 3-in-1 design — metal blade, plastic blade and soft pad included and interchangeable
• Retractable blades — secure storage at the touch of a button when not in use
• 18" (46 cm) format — the longest in the range, ideal for deep and large aquariums
• Floats — easy recovery if it falls into the water
• Ergonomic handle — comfortable in multiple cleaning positions
• White color — contrasts with the algae so you can see what you are removing
• Hanging hole on the handle — convenient storage

The three blades included

• Metal blade: easily removes stubborn algae from glass aquariums. Do not use on acrylic.
• Plastic blade: safe for glass and acrylic. Use with caution at the gravel line to avoid scratching the acrylic.
• Soft pad: first choice for acrylic aquariums. Removes algae even in superficial scratches.

Use in reef aquariums

The 18" size is the recommended choice for large reef aquariums and deep systems where shorter models don't allow comfortable access to the bottom of the glass. With a 46 cm reach, it effortlessly removes algae from the top all the way down to the sand. The blade cartridges are removable and slide out for quick changes between the metal blade and the soft pad or plastic blade, depending on the type of algae and glass.

Available sizes

• 6 inches (15 cm) — compact, ideal for nano and medium-sized aquariums
• 12 inches (31 cm) — versatile for standard aquariums
• 18 inches (46 cm) — ideal for large and deep aquariums

Replacement parts

Metal blades, plastic blades, and soft pads are available separately in 3-piece replacement packs. The Seachem Algae Scraper Replacement Kit includes a complete set of replacement cartridges. The blades are specific to the Seachem system and are not compatible with standard razor blades.

Manufacturer's precautions

• Always keep the blade retracted when not in use
• Handle with care to avoid injury
• Keep out of reach of children
• The metal blade should NOT be used on acrylic aquariums — risk of scratching

Why choose the 18" Scraper from ReefSolution?

The 18" size is the optimal choice for owners of the Red Sea Reefer 350, Reefer 525, and all deep reef aquariums. For standard aquariums, the 12" size is sufficient. Keep replacement blades on hand with Seachem Algae Scraper Replacement Blades and Seachem Algae Scraper Replacement Scrub Pads. For dry cleaning, consider a magnet like the Mag-Float 350.

Frequently Asked Questions

Why choose the 18" format rather than the 12"?

The 18" (46 cm) size is recommended for deep aquariums and large tanks where the 12" size doesn't allow comfortable access to the bottom of the glass. It's the ideal size for Red Sea Reefer 350+ tanks and aquariums 60 cm or taller.

Are the three blades included with the 18" scraper?

Yes. The 3-in-1 scraper comes with three interchangeable retractable blades: metal, plastic, and a soft pad. Replacement blades are sold separately for when they wear out.

Can a metal blade scratch a glass aquarium?

No, the metal blade is designed for glass and will not damage it. Never use on acrylic—use the plastic blade or the soft pad included.