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WATER TESTING & MAINTENANCE

Algae Scraper

Blade or pad on a handle — the tool that decides whether glass stays clear or gets scratched.

Maintaining stage Water
Unplug before servicingHands out of the water firstDrip loop on every cableTest before you dose30 ppm CO₂ ceilingCycle before stocking
WaterTechnical line drawing of Algae Scraper
Specification
TypeBlade or pad on handle
Blade materialStainless steel or plastic
Handle length30–70 cm
Blade width5–10 cm
ReplacementBlades sold separately
Magnetic optionTwo-part float cleaner
Technical parameters
Green spot algaeMetal blade required
Soft filmPad or sponge
Acrylic tanksPlastic blade only
Low-iron glassSoft — blade carefully
Cleaning intervalWeekly, before it hardens
Grit hazardRinse blade between strokes

Algae on the front glass is the most visible maintenance failure in any aquarium, and the tool you remove it with determines whether the glass survives the process. A blade removes hard green spot algae that a pad cannot touch; a pad removes soft films that a blade would smear.

Material matters, and it is not a matter of preference. Metal blades are safe on glass and will scratch acrylic permanently. Plastic blades are safe on acrylic and largely ineffective against green spot algae. On low-iron glass — which is softer than standard float glass — even a metal blade can leave fine scratches if a grain of sand is trapped under it, so the blade must be wiped between strokes.

The long-handled scraper with a replaceable blade is the practical choice for a rimless tank, because it lets you work the whole pane without putting an arm in the water. A magnetic cleaner is convenient but cannot reach the substrate line, and trapped grit between its two halves is the most common cause of a scratched tank.

Safety and welfare
  • Never use a metal blade on acrylic. The scratch is permanent and there is no repair short of replacing the pane.
  • Rinse the blade after every stroke on a sandy tank. A single trapped grain drags a visible line across the whole pane.
  • Keep blades out of reach of children and store them with a guard fitted.

Using it well

Scrape weekly before the algae hardens. Green spot algae removed early comes off in a pass; left for a month it needs pressure and risks the glass.
Work in overlapping vertical strips rather than horizontal sweeps. It is faster and you can see what you have missed.
For green spot algae specifically, check phosphate and CO₂ stability. Persistent green spot is usually a CO₂ distribution problem, not a cleaning problem.

Related to

Nerite snailCO₂ drop checkerAlgae control articleAquarium maintenance article
Note. Parameters are conventional ranges across the category, not the claim of any one manufacturer. Nothing on this page is for sale and no outcome for any plant or animal is guaranteed. Simulator output elsewhere on this site is a simplified model, not a measurement — confirm everything with a test kit and the equipment's own instructions.
Related

Works alongside

Nerite SnailPlantsDrop CheckerLighting