I’m making a custom mix because it’s cheaper than buying it premixed. I plan to have a 40 gallon tank, half water and half land, with a slope of 2”-4” on top of the drainage layer. The area will be around an 18” x 18” squares worth of land. I just can’t find a calculator to see if that is enough. I’m fine if I have extra
by Digital_Doodlez
2 Comments
Around 2.25 square feet
According to [this tank volume calculator](https://www.calculatorsoup.com/calculators/construction/tank.php) you only need 4.21 gallons of substrate for 18″x18″x3″ which is less than half of what you plan to buy