I was using Phosguard in a Freshwater tank that has a problem with Diatoms. Now my Java fern is turning yellow and leaves are dieing.

Java ferns are leaf feeders. They love phosphates.

can it be use on hang on back filter? with high flow rate?

I don't see why not, it may reduce the flow some, but if you are having a problem it truly helps. We do a water change once a month and change it every other month. Our tank looks better and the fish have been healthier. Good Lock !

I have some brown algae on my sand bed and green algae on my glass in my 20 gallon lps reef tank. will this help? can it hurt my tank in any way?

Brown algae (diatoms) & green algae can definitely be affected by phosphates & silicas. It won't hurt your tank at all.

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💧 Elevate your aquarium’s purity—because your aquatic world deserves the best!

COMPACT YET MIGHTY - 100 ml treats up to 60 gallons—small package, big impact for your aquarium’s water quality.
TURBOCHARGED CLARITY - Rapidly eliminates phosphate and silicate to keep your aquarium crystal clear and thriving.
OPTIMIZED FLOW DYNAMICS - Bead-shaped granules maximize water contact and filtration efficiency for healthier aquatic life.
HIGH CAPACITY PERFORMANCE - Highly porous media ensures extended filtration power, outperforming all competitors.
PERFECT FOR ALL AQUATIC ENVIRONMENTS - Safe and effective for both freshwater and marine tanks, supporting diverse ecosystems.

Seachem Phosguard is a premium phosphate and silicate removal media designed for both freshwater and marine aquariums. Its highly porous, bead-shaped granules ensure optimal water flow and filtration capacity, treating up to 60 gallons per 100 ml bag. Trusted for rapid and efficient contaminant removal, it outperforms competing products to maintain crystal-clear, healthy aquatic environments.

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Pet Type	Aquatics, Aquatics Water Conditioner, Aquatics Water Conditioner Conditioners, PetSupplies
Product Dimensions	3.18 x 11.91 x 12.7 cm; 68.04 g
Item model number	185
Pet Life Stage	All Life Stages
Item Form	Granules
Allergen Information	Yam Free
Color	standard
Size	100 ml Bagged
Volume	100 Milliliters
Number of Items	1
Quantity	1
Specific Uses	Aquarium Filtration
batteries required	No
Batteries Included	No
External Testing Certification	Não aplicável
Item Weight	67.9 g

Seachem Phosguard phosphate & silicate removal filter media for freshwater & marine aquarium, 100 ml Bagged

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