I'm looking right at a well used almond leaf, in my South American Tetra tank, and right beside that tank, is my Hillstream tank... the Hillstream's could really benefit greatly from the leaves, but I'm trying not to stain that water, as I'm trying to keep as much algae growing for the Hillstream's as possible... ( I've heard Mullberry leaves are good ) not sure of their staining ability , but any suggestions for leaf types to add, that would grow the good stuff, without staining the water???