Iam in my first ever grow.
I bought some seeds online and decided I wanted to do things as easily and as cheaply as possible. So I thought Id just use tomato food and ignore pH and just use domestic fluoro lights.
Bad Idea.
My plants growth was crap at first, so I gave in and bought a cheap HPS 400w light for 90 GBP, they grew a bit better but still not great.
However once I bought a pH test kit and some pH up and pH down stuff and then started watering and feeding with pH6.5 water the plants took off!
Then I chucked the tomato baby bio stuff and got some proper biobizz dope plant food, it made a huige difference!
My advice is expend some effort on checking and fixing pH. And use proper food.
I tried to do it all on the cheap and simple method and the results were crap.