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Granny11
Greater than one weekI have a 5 gal. and two ten gallons the nitrites was were high in all but the 5 gallons since my guppy, platy and dalmation females are now all on their second set of fry other than the last fancy guppies I purchased, this is her first set staying in touch with Seachem customer support using Stability, Seachem Prime every 48 hrs. my last tank which I started with some polyester from my filter.the old gravel and Seachem Bio Media having the last 10 gal. tank one week my tank was very cloudy looked at it and wow its sparkling and all four fish tanks nitritite are zero&Sparkling Ive been in the hobby one year the best thing I could have ever learned was about the Seachem products from the fish club Im in. did you know the 250L bottle of Seachem Prime Lasted one year ,communicating with Seachem customer support, having products that I know are keeping my beautiful fry happy&healthy! Thanks Amazon for getting my orders to me right way Ive worked hard, studed hard still learning sit at home on my computer, make my order and you get what I need to me fast.
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Claire Conger
> 3 dayThe bio-medium is little volcanic-type rocks, large pea size. I’m using about half the container (250ml, so about 125ml). I’ve put the rocks into a bag, purchased separately, that fits my filter. My tank is 15 gallons and my filter runs at 200 gallons an hour (sounds crazy) so the rocks get a lot of flow. When I switched to this brand, I left my old bio-medium in the tank for about a week, so the bacteria would populate the new medium. My ammonia and nitrite are running at zero. I rinse the bag of rocks about once a week, scrubbing it between my hands to clear the algae. The rocks don’t get clogged, so I haven’t had to change them out for fresh ones. It takes time to build the bacteria population, and it’s important to keep something in your aquarium where the little creatures can live. In the photo, I’ve layered a bag of eggshells on top of the Matrix. (The eggshells raise the pH.)
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James A Leffew
> 3 dayI have only had this for a month or two, but after destroying our tanks eco system during an attempt to get rid of snails, it has been amazing. For several months, the ecosystem was struggling to cycle correctly. We lost several fish, one at a time, until this purchase. Since adding the Seachem Matrix, the water is clearer, the fish are more lively and colorful. Overall its a great product and maintenance is easy, just rinse rocks off and reuse.
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Pagerone
> 3 dayGood works good
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alexis
> 3 dayI like this stuff, its versatile and the pieces are a good size.
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Trevor Hiller
08-06-2025I purchased this for my saltwater fish quarantine tank to have some biological media that wont absorb medications if/when I need to dose them. This is one of the few products that wont absorb copper and is recommended for use in Saltwater quarantine systems. Would buy again.
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Candido Kuhn
> 3 dayI used since longtime looks like doing nothing. waste of time money and space in filter.
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A.Migs
> 3 dayMy African cichlids feel like they are home
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JORGE
> 3 dayExcelente me llegó rápido es un frasco que contiene 250ml, ya lo tengo funcionando en mi pecera
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Victor Rivero
Greater than one weekbest price than any other store