Covid Grow w/ Glue Gelato & METH

My first indoor grow. Due to the 'rona everything was on 4-5 week lead times so bought what I could from amazon. The Kingbo 300w light I got seems ok, but after research i've ordered a Geeklight 120w COB LED as it seems like the better option. Im eagerly awaiting it from China right now. PH meter has broken :(. Water got inside and fried it. New one on its way from Amazon, needs to arrive soon as i i've got to water these plants. Have not been measuring substrate or feed temp, feel like they could be low and causing slow growth. Need to buy more measuring things I think.