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If i combine gravel from a ten gallon tank that is 2in deep and gravel from a 29 gallon tank which is also 2in deep could i or would i have enough to put in my 55 gallon tank?
Well a 55g is 48in long. A 29g is 30in long and a 10g is 18in long. You might be alright. I'm not sure on the depth of the tanks and that will be a factor also.