So, you bought a "20-gallon" tank at the local pet store. You brought it home. You filled it once fancy dragon stone. You dumped in two inches of costly volcanic soil. Now, youre looking at it and wondering: why does the medication dose for a 20-gallon tank mood gone its going to aim my fish into neon mutants? Well, here is the cold, difficult truth. Your 20-gallon tank is probably holding roughly 14.2 gallons of actual water. This is why you dependence the best aquarium substrate calculator volume calculator for exact measurements. Most people just wing it. They eyeball the water line. They guess. Then, they surprise why their pH is vacillation with a pendulum or why their costly reef salt isn't mixing to the right salinity. Ive been there. I bearing in mind nearly wiped out a colony of rare Blue drive shrimp because I thought I had more water volume than I actually did. Math matters.

Most entry-level hobbyists think a rectangle is just a rectangle. You believe the length, the width, and the height. You multiply them. You divide by 231 (if you are accomplishment inches to gallons). Boom. You think youre a genius. But youre not. Youre forgetting the internal aquarium measurements. Have you looked at the glass? High-end rimless tanks use glass that can be 12mm or even 15mm thick. If you put on an act the outside, youre calculating the volume of the glass, not the water.