Marineland Rite-Size Cartridge M, 4-Pack

we have a 20 gallon fish tank with about six kois and comets and recently purchased the Marineland Millennium 3000 filter system and i must say we are very pleased with it. Our tank is always so crystal clear. All you need to do is rinse the cartridges every so often and re-use. we have used one for over a month without any problems.

this product is hard to find in pet stores for some reason. It seems to get clogged up and need replacing very quickly. It is always a pain to get them in and out of teh filter

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Its a fish filter... you wouldn't be buying these unless you already had the filter...

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