check under the leaves for little black dots (spider mites) and get a chemical from the local garden store that controls mites, bugs and other unwanted pests.. also to me the plants look a little under waterd and 1 looks like it's going into stress trying to find sunlight.. other than that you should be fine:thumbsup: i used plant spikes for my last outdoor grow and they worked pretty decent.. this years grow i used a couple techniques.. 2 in MG mixed with perlite 1 in just good potting soil and 1 with just plain soil used for our flower gardens with a food spike, and the 1 with the spike is growing way faster and looking healthier than the others:jointsmile: