Specialized plant substrates like eco complete, fleurite, ADA aquasoil, AP, turface, etc etc... they are rich in nutrients and very fine grain, closer to soil than aquarium gravel.
I think you would have trouble growing something like dwarf hairgrass in your tank until you upped the light a bit more (running 5 or 6 of the bulbs) and added a CO2 system. It may grow in your substrate, but it wouldn't spread and go crazy like it would in aquatic soil type substrates.
You can definitely give it a try though. It is not expensive, especially if you have a local source. In my experience, it did not grow well without CO2, good nutrient rich substrate, and lots and lots of light.
I think you would have trouble growing something like dwarf hairgrass in your tank until you upped the light a bit more (running 5 or 6 of the bulbs) and added a CO2 system. It may grow in your substrate, but it wouldn't spread and go crazy like it would in aquatic soil type substrates.
You can definitely give it a try though. It is not expensive, especially if you have a local source. In my experience, it did not grow well without CO2, good nutrient rich substrate, and lots and lots of light.