there is a test that you can get that will tell you... saw it on youtube somewhere...may have been Vader OG...just saw it recently and he pretty much all I looked @ recently...
here: https://www.youtube.com/watch?v=ENqm63HdXJs&t=296s
Damn that opens some doors I dont think I want to look in yet. lol
I wonder how those coco coir cups would work for my SOG in the ebb & flow? Looks like it works for him.