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.

Cermedia Marinepure Marine Pure Biofilter Media Gems 90g Tan 905002

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐟 Elevate Your Aquarium’s Cleanliness with MarinePure Magic!

DUAL ENVIRONMENT READY - Safe and effective for both saltwater and freshwater aquariums
MAXIMIZE YOUR FILTER POWER - Over 1,450 sq ft of bioactive surface for superior ammonia & nitrite elimination
TRUSTED BY AQUARISTS WORLDWIDE - Highly rated with 4.6 stars and proven nitrate control for healthier aquatic life
LOW MAINTENANCE HIGH PERFORMANCE - Rinse once before use, no frequent cleaning needed to maintain efficiency
PERFECT FIT FOR NANO TO MEDIUM TANKS - Optimized size for canister, HOB, and nano filters up to 70 gallons

CerMedia MarinePure Biofilter Media Gems deliver an expansive 135 square meters of bioactive surface area in a compact 90g package, designed to boost filtration capacity in tanks up to 70 gallons. Crafted from inert ceramic, these ¾ inch gems excel at eliminating ammonia, nitrites, and controlling nitrates in both saltwater and freshwater environments, requiring minimal maintenance and fitting seamlessly into canister, hang-on-back, and nano filters.

Specifications

ASIN	B07N1359GV
ASIN	B07N1359GV
Age Range Description	All Life Stages
Best Sellers Rank	#59,488 in Pet Supplies ( See Top 100 in Pet Supplies ) #521 in Aquarium Water Treatments
Brand Name	CerMedia MarinePure
Care Instructions	Rinse before use. May place in mesh bag or basket to make handling easier
Color	White to tan
Customer Reviews	4.6 4.6 out of 5 stars (527)
Date First Available	January 22, 2019
Date First Available	January 22, 2019
Department	Pets
Department	Pets
Directions	Rinse before use to remove dust. Place in a direct flow area to focus on aquarium ammonina and nitrites, or in lower flow area for focus on nitrites. Cleaning is not usually necessary.
Included Components	Approx. 75 MarinePure Gems
Item Dimensions LxWxH	3 x 2.5 x 3 inches
Item Package Dimensions L x W x H	5.04 x 2.87 x 2.52 inches
Item Weight	90 g
Item model number	905002
Item model number	905002
Manufacturer	Cermedia LLC
Manufacturer	Cermedia LLC
Material	Ceramic
Model Name	MarinePure Biofilter Media Gems - 90g
Number of Items	1
Product Dimensions	3 x 2.5 x 3 inches; 3.17 ounces
Size	90g
Specific Uses for Product	Aquarium Filtration
Target Audience Keyword	fish
Warranty Description	1 yr

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