Green Man still posting...? Seen his how-to video's years ago. They're all over the web if anyone's interested. Him and Marijuana Man were helped me learn growing and growrooms when I was a bit too paranoid to post online. (many years ago)

Never seen one, but a guide to common misdiagnosis conditions would be handy for beginners, too. For stuff like leaf-tip irritation causing damage to other leaves, leaving puddles of spilled nutrient solution on leaves which can cause burned/necrotic spots, or oversaturating the leaves (foliar spraying too much) causing a myriad of negative conditions, or leaving pest sprays without rinsing which leads to clogging a plants pores and preventing it's ability to breathe...All with reference pictures to aid the newbies.

(just a thought in case anyone is inspired enough to give one a go...)