Hey guys. Sorry if this is going to be a wall of text for some of you but the harder I try to shorten what I write, the longer it gets, so bear with me here please. I'm gonna set a TL;DR at the end. A few weeks ago I made a thread asking about the quality of my water and if it would be suitable to use right from the tap. As it turns out (at least I think so), it's good to use as is, even though its "medium" with a rather high pH and ppm. I mentioned it since I would have just requested help in that thread, but I guess this topic is just too different and/or far away from the original point I had in the other thread. I was telling the people in the thread that I would be doing a journal, since it's my first DWC and my second grow in total, but I found out that I'm just a lazy bastard... again... sorry to anyone who was there reading this. Anyway, I'm at the end of week 3 now and I think it's time to ask you guys for some help and/or advice, since I think my ladies are developing some problems. I have 2 plants and as I said, they are at the end of week 3 today. I can't comment on the overall growth since I lack the experience to determine if they are growing well. I can just say that both are almost the exact same height, which is about 14cm. I'm using rather big plastic trash drums with lids that I wrapped thoroughly in tin foil. I went a bit overboard here, because I could fill up each of them with 35L of water. I'm using a 60L/min air compressor with 2 round 13cm air plates and by now (no idea why I just didn't check earlier) I know that these air plates can only handle about 2-4L/min of air output. The compressor is running quite hot, but I know that's totally normal and it also doesn't hurt my hand when I check the heat. The room temperature goes up to about 26C during this time of the year with lights on and close below 20C with them off. Unfortunately, the res temperature ranges from 22-24C, but I've been using hydroguard since day 1. A really bad thing is that I "assumed" the drums would not let light through or I was just not paying enough attention, I don't know... but the light leaked through quite a lot for about 1 and a half week until I realized the extent of it and wrapped the drums in tin foil. As much as I can check with the lids being slightly open, it seems to be near pitch black in there now. I'm using a 400W bulb and the distance to the top of my plants is about 40cm or 15 inches. Alright, so #1: Plant 2 started drooping about 1 week ago but the drooping is rather limited to the bottom nodes. Since drooping is only related to water intake as far as I know, this could have to do with the aeration. The air plates are working fine, but since the drums are not only rather high but also very wide, the bubbles are only covering the middle zone of the drums, about as wide as my net pots. This leads to the roots being "bubbled" away from the center and I don't know if this could be a problem. But since the plant is drooping, might this be the problem? I want to get the 20cm air plates asap, because they will almost cover the entire drum in width and they will also be able to get the maximum air output delivered by the compressor (20cm plates have up to 25L of air output per min). What are you guys thoughts here? #2: Both plants are showing small signs of deficiencies, but neither has the exact same ones. I'm fairly certain that I neither overdosed on nutes nor used too few. There are no signs of classic nute burn and I'm already using half strength nutes at this point. about 500 ppm but my tap water already has ~180 ppm to begin with. My best guess is that this problem is related to #3. #3: The most worrying one is that before I wrapped the drums in tin foil, I noticed "brown" speckles on the roots right below the net pot. This has been ongoing but at this point, the roots are more evenly colored (from the nutes maybe?) and the discoloration is pretty much limited to the roots above the water. The roots below the net pot started twisting at an early stage and now they are a few big twisted strands that only recently started to split up into an actual "mass" or "cluster" below the water surface. Those clusters are bright white but the big twisted strands got a bit darker over time. There are still brown speckles on the roots of both plants but those don't seem to have spread that much. Also, recently, I noticed a smell which went away overnight and then came back. The roots don't really smell that much themselves, but the res does. Smell is kind of changing between nute smell and water well smell, can't really categorize it. Could this smell be related to the beneficial bacteria from the hydroguard or could it be actual bad bacteria? And what could these brown speckles on the roots be? Is it just nute stains? Here are 2 pictures of the roots below the net pot and below the water surface. The roots of either plant looks almost exactly the same. I hope you guys can give me some help/advice, I would really love to not lose the ladies and especially, the time. Thanks in advance! TL;DR: Deficiency symptoms, most probably related to root problems (if these exist), see pictures above. Air plates (2-4L/min) probably too small (13cm) for the drums (~34cm width) AND the air compressor (60L/min), can switch out asap for the 20cm ones (max. 25L/min); one plant drooping, maybe related to the lack of aeration due to these air plates?