Clouds....I honestly have no animosity but....DUDE !!!..... Reread your post and ask yourself what's missing....you started adding about three weeks ago, but didn't tell us how old they ??....are,how many, what medium, any other nutes, how are you adding it, do you premix, if so how much water are you mixing up?, how strong is the solution. Etc, etc. I could go for a while but you get the point. If you want accurate help, you need to provide accurate info. We ( other users of RIU) are not mind readers, sometimes we probably can't be readers period. Think about where you are at. A stoner forum !!!
Having said all that.......In over 40 years, I have never been able to over feed the black strap.
Always happy to share the experience with newb's, but please be a bit more precise on your questions...Peace & be kind.