Quote Originally Posted by Sueshee View Post
Thank you. So the black means I will not need to cut them off correct? Another question I have is on one of the plants the roots are short & hard. Is the plant healthy? there is not any thin little roots
Black roots are bad. Generally from being damaged from the substrate, it's probably just too compacted. Mushy roots are never a good thing. Ever. Healthy roots are white and very fleshy.

The short and hard roots are probably due to the substrate also. Gravel is very dense, and not easy for plants to 'dig' their roots in.

Yellowing of the leaves is generally a nutrient deficiency.