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Anonymous
Deep sand bed might cause roting and create anaerobic pockets, wich will poison your fish. Either regularly disturb your sand (poke with something), dont make it too deep (3 inches max) or get malaysian trumpet snails who would mix the sand for you. Careful during the water change - sand is easily disturbed. Many fish love to dig in the sand - this is good for them, but bad for your plants that get easily uprooted and your filter wich can get cloged with sand and be ruined this way. Sand created from crushed corals/oyster shells will change your water chemistry, and also due to rough ages might harm your fish. Bright wight sand often gets dirty very quickly.
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