For the Miracle Grow... Isn't it best to use the kind made for Tomato's? Can't remember what it was about the regular Miracle Grow? I've been using the one for Tomato's and began using Epsom Salt - works excellent by the way. Got it for the fish emulsion I'm making.
PirateGhost,
I was using the same trays you are, but for Strawberries. Just a heads up to what I found on the underside of the trays. You may not get the same problem, but I didn't want to go on and not say anything as I thought of you when I saw it. I had a tray cover over mine, so that may have contributed to it? Anyhow, I was getting ready to add more water to allow it to soak it up through the bottom. I lifted one of them up and found mold and algae forming. It didn't get to the strawberries (just caught it in time - as it started). Yeah, I pulled them guys out away from everything quickly and carefully. I'm mentioning this to you just for a heads up. Check the bottoms of your trays, just to be safe. I'm not trying to scare ya, lol. Just a precaution to what I found on mine. The Strawberries are doing just fine too (60 of them to go in a pot and patch).
The Epsom Salt does wonders too.