Newbie (Please Help)

I’m a new grower, I got 2 plants one I’m low stress training and the other I tried fimming and bending the stem but its snapped in the edge so I put tape on it I also trimmed the leaves, and I recently discovered bite marks but no bugs. I’m using ocean forest soil and I’ve been checking the ph, anybody know what’s wrong with her??

Cover your medium with an inch of diatomaceous earth. Whatever is eating them won’t like it if they are groundbound.