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

Product ID: 253315499

Details

Brand
Seachem
Item form
Granules
Item weight
0.07 Kilograms
Liquid volume
100
Number of Packs
1

⚡Rapid phosphate & silicate removal

🌀Highly porous bead shape for optimal flow

💧Treats up to 60 gallons per 100 ml

S$17

Duties & taxes included

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Description

💧 Clear water, zero compromises – your aquarium’s secret weapon!

OPTIMIZED FLOW DESIGN - Bead-shaped granules maximize water contact and filtration efficiency for healthier aquatic environments.
HIGH CAPACITY LOW VOLUME - 100 ml treats up to 60 US gallons, delivering powerful filtration without bulky media bags.
KEEP YOUR TANK ALGAE FREE - Prevents phosphate buildup that fuels algae growth, ensuring your aquarium stays vibrant and clean.
CRYSTAL CLEAR AQUARIUMS FAST - Rapidly eliminates phosphate and silicate to prevent algae bloom and maintain pristine water clarity.
TRUSTED MARINE FRESHWATER SOLUTION - Engineered for both freshwater and marine tanks, outperforming all competing phosphate removers.

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 rapid contaminant removal. Each 100 ml bag effectively treats up to 60 gallons, outperforming competing products to keep your aquatic environment crystal clear and algae-free.

Specifications

ASIN	B00029PO6O
Allergen Information	Yam Free
Best Sellers Rank	#17,846 in Pet Supplies ( See Top 100 in Pet Supplies ) #992 in Aquarium Accessories
Brand Name	Seachem
Country of Publication	USA
Customer Reviews	4.5 4.5 out of 5 stars (1,964)
Global Trade Identification Number	00000116018500
Included Components	all
Item Form	Granules
Item Type Name	Filtration Media
Item Weight	0.07 Kilograms
Liquid Volume	100 Milliliters
Manufacturer	Seachem Laboratories, Inc.
Manufacturer Part Number	185
Model Number	185
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	000116018500
Unit Count	1 Count

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