@Rtush, It's tough to tell from the photos whats going on... Hopefully not a fungus though. Increase airflow in grow area and test your nutes to ensure its not a deficency. If you want, send me a PM with your email address and I'll send you a couple books - "Mary Jane Grow Bible" and Mary Jane Plant Care". These 2 books cover every single facet of plant growing (Including every disease, pest and deficency/overfeeding issues and how to address them).
@Fergie, I was using it yes! Just stopped now because the bottom soil is All-mix, and it's quit "hot" so you don't really need the alga mic. But it did his job when needed!