There is plenty of aquarium substrates out there. This is my recipe. This is exactly what I use. I mix this out in my back yard on a huge tarp, adding all of my ingredients that will MAKE YOUR PLANTS GROW LIKE CRAZY. I will help, hands on with you as you convert to dirt. You won't go back. $24. is for 5 LBs of Dustin's Dirt.
This price includes the shipping cost of sending 5 lbs ANYWHERE in the USA. One bag will work perfectly for a 10 gallon tank. Dirt must be covered with one inch of gravel. Just pour this bag of Dustin Dirt on the bottom of a bare tank.
DO NOT ADD WATER WITHOUT COVERING IT WITH GRAVEL.
Take enough REGULAR gravel to nicely cover it with an inch over the dirt. SLOWLY pour water in the aquarium. (Slow- like, as slow as you pee) Drain the tank and refill it a few times until the water is clear and plant away!
Need some fertilizers? Aquarium Plant Fertilizer Package (Small) is the way to go.
Welcome to a whole new level with your planted tank.
NOTE: this is just the dirt- this does not include the gravel you will need over top of it.