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Hey guys! Nice looking community. This is my first season in aquaponics. Here's my setup: 15 gallon cement mixing tray with a 20 gallon sump. Gravel is painstakingly washed bluestone. Water goes in through the window to my tank inside: 30 gallons. Don't just my scape - I have to do some trimming. I've got about 20 fathead minnows. Some of my plants are doing okay. Some aren't. The larger sprouts on the left are yu choy. On the top and right, kale sprouts. Everyone here started out in soil. My "control group" sprouts that I left in soil are doing really well, but these little guys are struggling: What's going on here? My first thought was nutrient deficiency. I realize I don't have a lot of fish. I could add some more, but it's not my favorite idea - not a fan of a crowded tank. How about liquid ferts? I've got a bunch of chems (potassium nitrate, potassium sulfate, mono potassium phosphate, magnesium sulfate, iron chelate) lying around, so I can mix my own if you guys see anything missing. Alternatively, I was thinking my drain cycle might be a bit fast - 5 minutes to fill, 1 minute to drain. From conventional gardening, I'm used to interpreting this kind of yellowing as a sign of over watering. But is that right for leafy greens? Let me know what you guys think! I appreciate any help you guys can offer.
I have been trying to locate a source of organic hydroponic nutrients here is the USA to follow up on the statements made in other forums. Can anyone tell me some sources for such nutrients, all I have found is the pot organic stuff that is expensive. Clint