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Haha, that's just algae buildup because I bottom feed my plants with a tray filled with water. I clean it every couple of weeks, just happened to be right before harvest/breakdown so I just kind of left it like that for then.

Oh okay, I've never bottom fed. Seems like they really liked it though?!

I'm fairly lazy and seem to not know how to top feed correctly. Honestly, whatever works for you is best I think, but my plants seem to love it and I see roots burst out the pots!

Yeah they sure do seem to !LUV it. I didn't even know top feeding was difficult or needs to be done a certain way, I thought you just pour water on them until they seem wet? Oops, back to the drawing board, haha! There's always more to learn.