Newbie here. I'm growing hydroponically at home in a grow tent. All the plants were perfect until this morning I noticed these on the leaves of two of my beefsteak tomato plants. They are both on the top and under the leaves. I didn't see any mites or spiders. Fungi maybe? As a precaution I cut away all the affected leaves. I googled to find about it, but didn't see anything that looks like it. Any ideas for identification and what to do will be greatly appreciated.
by Various_Storm1703