Robertsanswered grow question 2 years ago Use half of what is recommended on bottles, and charts. 2nd week of bloom your tds should be around 1000. Knowing the size of plant would also help. Plus what it is growing in. So No one can tell you exactly how much without seeing the plant. It is purely a guessing game. This is why a diary is important in helping with questions. So good luck. 👍🏻