Safe & Non-Toxic 20 Pound Bag of ''Acrylic Coated'' Gravel & Pebbles Decor for Freshwater & Saltwater Aquarium w/ Vibrant Rainbow Glow Style [Neon Green, Pink, Orange, Blue & Yellow Colors] by mySimple Products at The Wharf Express. Hurry! Limited time offer. Offer valid only while supplies last. SIZE OF SUBSTRATE: Substrates vary widely in terms of size - everything from sands consisting of very tiny particles to larger river rocks. Large particle substrates allow more uneaten food and waste to penetrate into it leading to toxic build ups if not cleaned. Small particle substrates can compact which may lead to areas that lack oxygen. These areas can eventually release hydrogen sulfide - a substance that is extremely toxic to fish. The size of the particles also has a big impact on the he
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