okay so this is my first groW... im groWing three plants from seeds i got from my brother... 2 of the 3 plants are doing fine.. one of the plants has just stopped growing and its getting the same treatment as the others. the others flowers have already started to come out While the other plant stays the same size day by day. the plants are about 4 days old. the stem is pretty purple on the one thats not growing... any thoughts? thanks.