thanks all. initially, my last post wrote "too expensive for my needs" and I changed it. cost is a consideration but it's not a concern provided I get something that can be of assistance to all the plants and doesn't require extensive constant maintenance.
ideally i don't want to be spending lots and lots but if we're talking about a bag of aqua soil or Eco complete, then that's okay. I guess it's about being much more educated on it vis a vis my needs but back to my initial post, something that's all purpose and is black or dark would be great. it's a small 8 gallon tank so I don't need stupendous amounts.