am seeing long hairlike algae. this is what i am after; spiro and similar green hair. Most is brown, likely due to photolimit induced die back. a small tuft growing on a low two dimensional grid is pure green. This is exactly what i want. i think the light is lower here but it may also have something to do with bacteria having less substrate on this media versus the pad media or the depth of water and or lower current caused by being recessed lower than the surrounding pads. the bac may have speeded initial growth but then overrun the algae on the pads. score one for 2d plates vs. 3d pads.