Do alittle search but I think thats okay.Dont quote me though thats why I said do a search.Im new to hydroponics and only grew in soil at times. Is it different for soil?I think so because I always remember being at around 6.5.
depending on product used and how often you "play" in your room, you can be ideal and keep Ph between 5.5 and 5.8 or if you wish to go longer you can drop it as low as 5.2 and let it drift up to 6.2