A HUGE thank you to everybody who has posted on here. I've carefully read all of your suggestions and found some really helpful advice.
I think that once all of the plants have dry soil I will transplant them into better pots. I'll continue to use the Ocean Forest brand of FoxFarm when I transplant, but per your suggestions I think that I'll give soiless mixes a try next time around. And I'll def lay off the nutrients. Hopefully this will clear up my problems. I will be sure to post back here if the sickness continues and once again thank you everybody for helping me out! You guys are awesome.