you could ask ten different people on this forum and get different answers,depending on their experience .IF, i made a misstatement..., my apologies! but it is something that i have read on this forum.(not sure where) and it is something i strive to do. i want to give the plant the maximum amount of nutes, and that is the sign i look for.( as per this forum ) i will now have to do some research. so thanks for the challenge, just keep it civil!