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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Seachem PhosGuard, 100 mL bagged - 67101850

Product ID: 5505821

Details

Brand
Seachem
Item Form
Liquid
Item Weight
0.07 kg
Liquid Volume
100 ml
Number of Packs
1

🌊Rapid phosphate removal

💧Optimized water flow

⚙️Highly porous bead design

Bs.232

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Description

💧 Clear water, clear edge — don’t let your tank fall behind!

SAFE VERSATILE - Ideal for marine and freshwater setups (except phosphate-buffered freshwater).
BEAD SHAPED BRILLIANCE - Engineered beads maximize water flow and filtration efficiency.
HIGH CAPACITY POROSITY - Ultra-porous media ensures longer-lasting phosphate absorption.
OUTPERFORMS THE COMPETITION - Trusted by thousands with a 4.6-star rating for superior results.
PHOSPHATE SILICATE SLAYER - Rapidly purifies marine & freshwater aquariums for crystal-clear water.

Seachem PhosGuard is a premium aquarium water treatment that rapidly removes phosphate and silicate from marine and freshwater tanks. Its highly porous, bead-shaped media optimizes water flow and filtration capacity, outperforming competing products. Perfect for aquarists seeking crystal-clear water and healthier aquatic environments.

Specifications

ASIN	B00029PO6O
ASIN	B00029PO6O
Allergen Information	Yam Free
Best Sellers Rank	#7,436 in Pet Supplies ( See Top 100 in Pet Supplies ) #45 in Aquarium Water Treatments
Brand Name	Seachem
Customer Reviews	4.6 4.6 out of 5 stars (2,006)
Date First Available	October 30, 2005
Department	Unisex-Adult
Global Trade Identification Number	00000116018500
Included Components	Seachem PhosGuard, 100 mL bagged - 67101850
Item Form	Liquid
Item Type Name	Seachem PhosGuard, 100 mL bagged - 67101850
Item Weight	0.07 kg
Item model number	185
Liquid Volume	100 ml
Manufacturer	Seachem Laboratories, Inc.
Manufacturer	Seachem Laboratories, Inc.
Manufacturer Part Number	185
Manufacturer recommended age	1 month and up
Model Number	185
Pet Type	Fish
Product Dimensions	1.25 x 4.69 x 5 inches; 2.4 ounces
Target Species	Fish
UPC	000116018500
Unit Count	1 count
Warranty Description	Warranty

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TrustScore 4.5 | 7,300+ reviews

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Bs.232

Duties & taxes included

In stock

Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Bolivia.

Secure transaction

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