I will be setting up a 180 gallon tank soon with geophagus species and was planning on planting about 1/3 of the tank with Vallisneria, Hairgrass, and Nymphaea- it will be low-tech. My question is, firstly, should I just not bother planting this tank at all being that they are geo's and they filter through the substrate continuously? I really want some plants in it, but I don't want to be unrealistic. However, if you think that it is doable, planting around 1/3 of the tank, what type of soil should I use? I am getting so confused with the different types: ADA, Eco-complete, Fluvel... When I placed a layer of soil down, could I then top it with something like gravel and then top the gravel with a deeper layer of sand? Or, would the geo's just upend this in the long-run. Do you have another suggestion? @BeanFish , @ashenwelt, @KinsKicks, @Zahc or anyone else who would like to jump in.