Nice im looking for a cheap sub for my 40g im setting up now. Wanted to go "ghetto" cheap just to see if I have good results. Im planning on a heavey stem plant tank with dwarf ciclids and schooling fish. Now im torn between the Montmorillonite clay at drillspot, or the Black Diamond at tractor suply. Both seem very reasonable compared to most aquarium substrates. i was stuck on doing a dirt tank but with mostly stem plants I will be replanting alot and read that dirt tanks get messy if you are consantly replanting.