Hey StuntmanMike86 this happens to be pretty funny because my plants are pretty much exactly as old as yours maybe off by a week or two at the most. Well im currently growing outdoors and I just started using neuts and I got same kind (Miracle Grow all Purpose Plant Food) and my plants are digging it they've grown over 3inches in the last 4 days. I water my plants about every other day and and I use the Miracle Grow every other time in between, only starting off with 1/4 of the recommended amount so my plants dont get a full dose of neuts too quick and this has seemed to work great results for me. Also I don't plan on using this for to long im sure I will upgrade to something better and more suited in the next few following weeks but for now since the wallet is a little low this is working fine for me, so I wouldn't be to discouraged.
(Also just want to say my plants look nice and healthy, this is also my first time grow
)
best of luck, xCrazyFoox.