I bought this for my shrimp nano tank. The magnet works great. The small size is perfect for my 2.5g tank. The only downside is that the scrubber "jumps" as you walk and doesn't remove the algae in one go. I use a twisting motion while slowly tracing it across the glass. This method worked great for me. If you have a large area to cover, it may take some time to literally "clean out" the algae. I haven't had enough time to comment on durability yet.
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