I have 3 panda cory catfish in my nano tank. will this hurt them or eliminate their food source?

Not at all. I have the same Corries and they are fine. I used this product all the time and it is great, you will see great results over time no more than 3 to 4 weeks your filter(s) are cleaner and the debris/waste is less.

Is it safe for snails?

Hasn't killed mine and I use it when I clean the aquarium

Can this be used with sand substrate

You can use it with sand substrate.

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Hagen Fluval Biological Cleaner for Aquariums, 8.4-Ounce

Hagen Fluval Biological Cleaner for Aquariums, 8.4-Ounce

Product ID: 224805314

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Details

Brand
Fluval
Liquid Volume
2.5E+2
Item Weight
318 g
Item Form
Liquid
Manufacturer
Flual

🐠Optimized for heavily populated tanks

🧪Digests waste in filters & gravel

⚙️Rapid organic waste reduction

Description

🐟 Keep your aquarium pristine and your fish thriving—because your tank deserves the best!

DUAL ACTION PROTECTION - Pairs seamlessly with Fluval Biological Enhancer to neutralize harmful ammonia and nitrates.
TAILORED FOR THRIVING TANKS - Perfectly formulated for goldfish, cichlids, and densely stocked aquariums.
TURBOCHARGED WASTE BREAKDOWN - Rapidly eliminates organic buildup from overfeeding and fish waste for crystal-clear water.
EFFORTLESS AQUARIUM MAINTENANCE - Slash cleaning time by targeting gravel, filters, and decorations with precision.
UNIVERSAL FRESH SALTWATER USE - Versatile formula supports both freshwater and marine ecosystems with ease.

Fluval Biological Cleaner is a powerful liquid solution designed to reduce aquarium maintenance by rapidly breaking down organic waste in gravel, filters, and surfaces. Ideal for heavily populated freshwater and saltwater tanks, it supports healthier aquatic environments and works best when combined with Fluval Biological Enhancer for comprehensive ammonia and nitrate control.

Specifications

Brand	Fluval
Liquid Volume	2.5E+2 Millilitres
Item Weight	318 g
Item Form	Liquid
Manufacturer	Flual
UPC	015561183550
Global Trade Identification Number	00015561183550
Country of Origin	USA
Item model number	A8355A1
Product Dimensions	5.84 x 5.84 x 15.24 cm; 317.51 g
ASIN	B00G25IBBW

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