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Here is a customer's DROP.6 on an early installation, probably just a few days. Can't tell if it's fresh or saltwater though, because the growth is very black slime which grows this way in very high nutrients anywhere.
More important is to see how the growth follows the LED red light pattern, from the LED on the right, towards the left, as it widens.
This 1-LED small scrubber may not be enough for the very high nutrients in this tank, but if the black slime is toothbrushed off in a sink often (like every 3 days), then nutrients may eventually come down in the water enough so that the the growth may turn into green hair.