Is this a bug eating my plant?

Hey guys,

Can you help me figure out if this is a bug eating my plant? (2 spots marked in red in the picture below)

I have 2 auto-flowering plants, a Cream Caramel Auto from Sweet Seeds and a Pineapple Express from Barney's Farm. They are both 16 days old and the one below (which I think it's the Pineapple Express... yeah I suck for not labeling them) got these "bites" 2 days ago but I haven't seen anymore yet.

Thanks in advance for any help. Also, if you notice anything else please tell me as I'm a first timer and I'm not sure if its going well

I don't see any evidence of insects. She looks nice and healthy thus far!

Thanks bigjesse,

I didn't see any other "bites" so I guess it wasn't a bug afterall, BUT, now some leaves on one of my plants are getting little brown spots

From what I've read, it could look like a heat problem, but I guess that can be discarded as it's happening in the bottom leaves and the top ones look fine.

I also read it could be splashes of nutrient solution that sat there and caused a burn. I use very light feeding of organic nutes (BioThrive) about 2ml per litre of ph'd water to 6.5.

From the pictures in the self diagnose thread it could look like an early stage of Calcium deficiency, or maybe Potassium... I dunno

What do you think?

And another question I would have is: should I cut some leaves off? It's starting to get bushy in there.