I'm not so sure it was from the ST or the super concentrate "Spoonit" orchid food I added, 30-10-10. I wouldn't even call the dosage a 1/4 strength and that was the only plant to react. I gave them more last night, same dosage, and this morning they are all looking great, even Mrs. Burnsalot. I'm just trying to get some good Veg nutes onboard before I switch them over to flowering this weekend. I'm also using a small layer of MG moisture control soil.