2 plants seems to have serious deficiencies, the leaves get brown spots and then they slowly die off. To try and stop this from happening I used some feed for the vegetative growth.
(The one in the picture is the random seed, it's a small plant but it is the most developed. (By far))
Don't be shy here, we are here to help. Use a grow question if you have it? You need to post pics of the issue, full plant and some zoom in shots of the issue. Ask away, no one will give you a hard time, we are here to support eachother and help out. You also don't have a lot of the info filled out like nutrients, ph, ppm/tds, and humidity which will be used to help determine what your plant needs. Please fill out these info so we can help ya, good luck!
Thanks for your message! I posted some pictures so maybe you have an idea?