Your soil looks like it holds moisture really well. I've never actually used a Jiffy mix before, but I use their pellets pretty frequently. If it's anything like the pellets, it's loaded with peat. All the water retention can eventually suffocate the roots on tender seedlings, and young cannabis roots can be pretty fragile.

You might think about transplanting into slightly larger containers, and "cutting" your soil mix with some perlite. Should make a world of difference for your roots.

Level25Noobmaster: Love the screen name! :thumbsup: