Hi, I tried TWBM/CBS with low-tech and failed. Well, shrimps survived but never breed. So they ended dying. Now, bad news needs good news. I'm starting a new low-tech tank highly using Anubia var. Nana. Here's the hardscape: And here's what it looked like juste before filling water: Since then, it is filled with water. I added a few HCC spots, Spirodela polyrhiza on top and a few plants have their roots in the water. As usual, just "Sable de Loire" sand and light. Not mechanical filter, no CO2, ... Water is the same that was in the tank before. That is "Volcania" probably modified by the previous technical soil. I will complete evaporation with tap water as time passes. Not sure about the population yet. Snails are already in. Shrimps has to be identified. Microfish, maybe. Time will tell !