| | Re: My New Mini-M and Mini-L Iwagumi Tanks
You can definitely use all Amazonia II normal size substrates. I went with a topcoat of powder because I like the grain size in proportion to the tank. The two sizes got mixed up when I played around with the rock placement so my substrate is pretty much a mixture of the two now. It doesn't really matter IMO.
As for the wattage, the Archaea fixture on the Mini-L is 36W and the Solar Mini-M is 27W.