Hello, folks. I've enjoyed being a fly on the wall in this lovely place. I appreciate your vibe! I'm about to buzzz attention to myself though. I'm getting started in a new place, and I'm having trouble diagnosing my problem. I'm using a GH WaterFarm with GH nutes (strength: between that for seedlings and the general, mild solution). I topped off the 13 gallons I started with by adding 5 gallons of clear water I ran through a hiking filter (no nutes in the top-off). I've got four units under a 400W light in a 63-degree-F room @ 50% relative humidity. I have a well and HARD WATER described by the tester from Sears as “one grain of hardness,” after processing by the Kenmore water softener. No iron, no bacteria. I'm guessing the mineral content is predominantly calcium judging by the white residue – although there's a little reddish coloration (sulphur?), and I don't know how much magnesium, if any. In short, I suspect it's a water problem. When I returned after a few days away during Xmas, there was a lot of white residue on the seedlings, too (clogging their “pores”?). Since then, I've sprayed them down with bottled water once or twice a day. But they're still very sick, dying I presume. I can start over; but I would very much like to get it right! I've attached some pictures of my gasping seedlings, propped up on tooth-pick and straw scaffolding. Help! What's my problem, and how do I fix it? Or how do I provide more information so I'm asking my question better!? Thanks all, and peace.