Sand over Eco-Complete - bad idea?
I am going to be setting up a 46g tank in a few weeks and was going to use 2" of Eco-Complete below 1-1/2" of Pool Filter Sand. I mentioned this to my LFS, and they recommended against it, saying that I will have problems with poor gas exchange. They said that without a heating cable to force circulation through the substrate, that the substrate will become anoxic and form hydrogen sulfide which will kill the plants.
The strongly recommended just using 100% Eco-Complete.
Any comments? Agree? Disagree?