patience young padawan (side note, went out yesterday and got a bunch more e.evergladei, not sure if any e.gilberti are in there but I'll have to check. Also some kind of najas grass with curly tips made its way in)
Hi
I think if I were you I'd fill the tank with water to see how stable the soil will be .??
I've tried this on several tanks and the best IMO is either "topsoil" or boiled canadian peat. Most potting soils have too much organic matter and /or fertilizers. There is also a period where the bacteria form gas pockets which blows up a nice display lol.
Anyway filling with water will give you some idea how it will behave?? Good luck gary