Helping a non-web friendly friend with his medical grow. These appeared on some of the leaves. Not sure if its bugs or a nute issue. 400 watt hps 18/6 light cycle Temp and humidity is not very regular but it does not go below 50 and not above 95. Fox farm ocean forest but he has added about 30% perlite to it. The perlite he used was miracle grow perlite with added nutes apparently. It has a rating of N 0.04 P 0.01 and K 0.06. He has bugs in his room for sure but im not sure if they are problem critters. Sometimes i see these beetles that look like they have a shield on they're back. They like to sit on the plants. Ive also seen silk string going from one side of the room to the plants, not a web, just a single string here and there. I also saw a few tiny black bugs on the leaves that you wouldn't be able to see if they were not moving.