How Much Rock For A 29 Gallon Fish Tank?
How Much Rock For A 29 Gallon Fish Tank? The general rule of thumb is 1-2 pound per gallon (for standard size aquariums). How much substrate do I need for a 29 gallon tank? Aquarium Size* (gallons) #s of Substrate #s of Substrate 10 10 – 20 15 – 30 20L/29/37 29 – 5850 –