Hey buyyouabeer, it's just a small cube of rock wool, the algae is on the top layer, I've rinsed it off and it's mostly gone now..Curious about all the algae looking stuff in your medium? Seems like that would drown and choke out your roots.
Well that sucks balls, I went ahead and flushed my medium, washed all the fuckers off the sprouts and now I'm looking for how to deal with thrips.Looks like thrips to me