Adding additional pebbles to 20 gallon freshwater tank

Perbud

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Hi All..Iā€™m thinking of adding more substrate to bring it up to 3 inches in my existing tank.Since the initial layer is about 1 inch of natural pebbles is it safe to add new identical natural pebbles to the old 1 inch layer?
 
Yes it's perfectly safe and fine to do. Just wash the new gravel under tap water and when it's clean, add a handful at a time to the tank. Start at one side and careful spread it over the existing gravel.
 

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