He will learn by his mistakes. Some ask and really don’t want to know….I would go with a quarter strength. My brother is a new grower(and is doing his best to kill the plants). He told me yesterday he is getting leaf tip burn. I told him to skip a feeding or two. He said he is worried that he may lose some yield. I told him again to skip a feeding. He said he might just feed them half strength. I told him that there is likely nutes built up in the soil and I would skip a feeding or two. He said he’d probably just go with half. I told him again to skip a feeding… grrrrrr…