How often do they need to be changed?

These types of media don’t need to be changed, there’s bacteria on it that helps lower nitrites and nitrates.

Do these need to be cleaned or changed? Or do I just leave them alone?

As long as you place them after mechanical filtration, they do not need to be cleaned.

Is it safe to put these directly in my tank?

hello yes you can use the Marine pure Gems directly in your tank , if you want to get some help you can add bacteria in liquid directly on your gems to accelerate their growth.

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Marine Pure Biofilter Media Gems - 90g,Black

Marine Pure Biofilter Media Gems - 90g,Black

Product ID: 146883496

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🌊Supports up to 70 gal tanks

🖤Inert black ceramic

🧩1450 sq ft surface area

Description

🖤 Elevate your aquarium’s ecosystem with Marine Pure Biofilter Gems — where science meets sleek filtration.

DUAL COMPATIBILITY - Engineered for both saltwater and freshwater aquariums, ensuring versatile, reliable performance.
EFFORTLESS MAINTENANCE - Lightweight 90g pack fits mesh bags or baskets for easy rinsing and hassle-free handling.
INERT CERAMIC COMPOSITION - Non-toxic, hypoallergenic black ceramic media that won’t alter water chemistry or harm aquatic life.
MAXIMIZE YOUR FILTER POWER - Over 1,450 sq ft of bioactive surface area turbocharges beneficial bacteria growth for crystal-clear water.
PERFECT FIT FOR NANO TO 70 GALLON TANKS - Compact ¾ inch gems optimize filtration in canister, hang-on-back, and nano filters alike.

Marine Pure Biofilter Media Gems are ¾ inch inert black ceramic pieces providing over 1,450 square feet of surface area to enhance beneficial bacteria growth. Ideal for canister and hang-on-back filters in freshwater and saltwater tanks up to 70 gallons, these 90g media gems improve ammonia, nitrite, and nitrate control while being hypoallergenic and easy to maintain.

Specifications

Product Dimensions	7.62 x 6.35 x 7.62 cm; 90 g
Item model number	905002
Pet Life Stage	All Life Stages
Allergen Information	Hypoallergenic
Colour	Black
Size	90 g (Pack of 1)
Number of Items	1
Quantity	1
Care Instructions	Rinse before use. May place in mesh bag or basket to make handling easier
Specific Uses	Aquarium Filtration
Batteries required	No
Batteries Included	No
EU Energy Efficiency Label	High
Item Weight	90 g

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