That is the picture of exactly what we used and it has done absolutely fine. Plants and fish are healthy as can be. They are 100% organic, so are safe for the tanks. (Funny enough I asked my boyfriend the same question when we were starting our tanks, and he would never, ever put anything in our tanks that would hurt our fish.)
this is the link to Oldfishlady's thread on how to do a planted soil tank and she uses all kinds of natural, home, local, and other soils mixed together.
I wouldn't think you need to change your tank at all. Our fish have been absolutely fine and plants growing like crazy. I won't be changing our tanks, i was just interested in the difference.
Send Oldfishlady a PM if you are truly concerned but like I said, i don't think it is an issue at all.