Really??? Are there nutes??? Nope just straight water... Damn... Spex?? No I didn't get the ppm meter, the day I went it wasn't in stock. I've read 1000 different feed schedules & formulas to mix up, different mL of the different nutes and went with what's worked the best for others. I feel like if it was nutes it would be a lot more than 10% of the leaves, but I'm also not sure, so possible could be nutes. At any time when you read your ppm and it was off, either to much or not enough did less than 10% of the leaves & of that less than 10% of the leave be yellow? It's been that way since the start, and even with seeds I cracked this statement even applies. I guess getting that ppm meter will be the for sure 100% way of telling me, but I really don't think it has to do with nutes....