Hello I'm a little new to this and this is my first grow. I've been having problems with the PH of the sustrate and my plants have been growing very slowly, so slow they're in their 25th day of veg grow and they tallest one is only 12 cm tall. Theyre meant to grow for a week more, but I dont think they will be taller than 15 cm. I'm not sure if I should let them stay in veg for a few more weeks, with the problem that I dont have a lot of time and the bill will also raise. Please I need some advice on this I dont know what to do. Thanks!!