How much substrate?
I'm about to upgrade my 10g into a 30g or a 38g (they both have the exact same footprint, the latter is just taller).
I'm planning to use Seachem's Fluorite orginal as the one and only substrate in the tank. My question is, how many bags should I buy? How many pounds of fluorite for a tank that size? (36L x 12 1/2W).