I have a 33 gallon tank. I tried different HOB filters. Some are better than others, but this canister WILL DESTROY THEM. I used to have chronic problems with brown diatoms despite frequent cleanings and water changes. After a thorough cleaning, my plants and decorations will turn brown again in at least 1.5-2 weeks. This completes the filter. I cleaned my aquarium thoroughly when I installed this filter (discoloration of decorations and stones and glass cleaning) and it has now been a MONTH and the aquarium is still spotless! (I still do water changes, but that's about it). I couldn't be happier with this filter setting.
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