You'll need more sand if you want to put plants in it than if you don't. One pound per gallon is an okay guideline. However, it does not take into account the dimensions of the tank. For example, a 110 gallon tank does not need any more substrate than a 75 gallon, since they have the same footprint.
I have 100 pounds of play sand(that i hate.i should've used beach sand instead like i did in my other tanks in the past) in a 90 gallon .Base is about 2- 3 inches high with one sword plant and about 8 little bushes of dwarf hair grass that keeps growing like crazy..
try one bag out of the time, if that don't look good, try the 2nd bag,if that dont look good try 2 and a half bags
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