Quick answer
Use a floating magnetic brush or a gentle scraper designed for your tank material, and always wet the glass before cleaning to avoid scratching.
Why scratching happens
Scratches on aquarium glass usually come from using abrasive pads, cleaning dry glass, or picking up grit from the substrate. Even a single grain of sand dragged across the pane can leave a permanent mark. The key is to use tools that lift algae without grinding debris into the surface.
Step-by-step scratch-free glass cleaning
- 1. Prepare the water: Turn off filters and pumps to avoid sucking debris into the mechanism. Use a gravel cleaner (like BLU 9025 SMALL) to vacuum the substrate and remove loose particles that could scratch the glass. Cleaning the substrate first prevents floating grit from getting trapped under your glass cleaner.
- 2. Wet the glass: Spray or pour tank water onto the glass surface before you start scrubbing. Dry glass creates friction that can leave micro-scratches, especially if any algae has a hard crust. Always wet the glass – never scrape dry panes.
- 3. Use the right tool for your tank: For plastic tanks, use a floating magnetic brush like the BLU 9031 MINI. For glass tanks, choose a larger magnetic cleaner or a plastic scraper. Move in slow, overlapping strokes and rinse the tool often to remove trapped grit. Check your tank material – the wrong tool can cause permanent scratches.
- 4. Rinse and inspect: After scrubbing, remove the magnetic cleaner and rinse it under running water. Inspect the glass for any missed spots or stuck-on algae. If needed, repeat with a gentle pad – never use steel wool or kitchen scouring pads. Rinsing the tool between passes is the single best way to avoid dragging grit across the glass.
Tools that help
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BLU 9031 MINI: Magnetic brushes for aquariums are floating, available in four sizes. The smallest model (BLU 9031 MINI) is ideal for plastic aquariums. A floating magnetic brush lets you clean both sides of the glass at once without reaching into the water, and the right size prevents pressure marks on thinner plastic walls.
BLU 9031 MINI
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BLU 9025 SMALL: This gravel cleaner removes dirt and debris from aquarium gravel and is also useful for turtle tank bottoms. Removing loose debris from the substrate before scrubbing the glass reduces the risk of scratching because less grit is suspended in the water column.
BLU 9025 SMALL
