Squirrel Tail - Bought Clone

I bought this plant from a stall at the side of the road B50/£1 My plan is to "practice" with this plant before the other plants reach this stage. I have had the plant for less than 1 week. I have repotted the plant from a plastic pint pot where it had been root bound. I have no idea how old the plant is and have guessed at the age for reference purposes. I think I have been over watering so I have knocked that back. I'll see how that goes over the next week. Just received delivery of nutrients from Siam Sativa, so I will begin that regime and see how that goes over the next week. A plant app that I was trying out suggested an area with more light so I have relocated all the plants and see how that goes over the next week. Soil metre on the way so hopefully that will remove some of the guesswork. Can't help but get the feeling I'm making a lot of mistakes