Raising the Bottom
I have a 55 gallon that I want to set up with plants. I want some plants to grow up and out of the water. Since the tank is so tall, I am planning to keep the water level 5 to 6 inches below the top rim of the tank to create and ample air space for emergent plants. But I would also like to build up one side of the tank substrate to get some of the plants even closer to the water surface. What are some techniques to do this without creating thick, anaerobic areas of soil. If I build up some areas with hydroponics clay balls, then cover with thin layer of soil, will that work? What happens in the water-filled void under the soil in that case? Looking for ideas and wisdom.
Bump: Maybe layer up some flat, slate stone?