Im looking to cutting some costs for my tank by adding a couple different types of substrates to my new 30 gal tank. From all the countless reviews, it seems ADA Aqua Soil Amazonia (both kinds) is the best. Of course you have to pay up for the goof stuff. I was hoping I could add some Fluval Plant and Shrimp Stratum on the bottom of the the ADA to save some $. Are there any significant downsides to this?