Ето няколко полезни калкулатора за торове:
http://web.archive.org/web/20080601051640/http://www.csd.net/~cgadd/aqua/art_plant_aquacalc.htm (http://web.archive.org/web/20080601051640/http://www.csd.net/~cgadd/aqua/art_plant_aquacalc.htm)
http://www.cherniaksoftware.com/homepage/Data/NutriCalc.exe (http://www.cherniaksoftware.com/homepage/Data/NutriCalc.exe)
Още един. Благодаря на колегите от македонския форум за акваристика (http://forum.mkreef.com/).
http://calc.petalphile.com/ (http://calc.petalphile.com/)
http://www.theaquatools.com/fertilization-calculator (http://www.theaquatools.com/fertilization-calculator)