As Faddenator noticed: Some of my babies have been yellowing. They also aren't growing very fast any more.

After a little experimentation I have concluded that this is a pH issue, and I've most likely have never experienced this before since I've previously never worked with organic fertilizer. I grabbed some pH+ & pH- solutions, but the store was out of proper testing equipment so I haven't used any of them yet. I grabbed a cheapo non-digital 'soil meter' which is obviously not very accurate but seems to think things are too acidic.

I've rinsed the unhappy plants' soil thoroughly with water and would like to start properly adjusting the incoming liquids from here on out. I'm wondering how specific of a range/resolution I need in a testing paper, or whether I should forgo them altogether and shell out for a proper pH meter and all the gear that goes along with maintaining and calibrating it. Testing liquid/strips/paper with a resolution better than 1 point (those which read down to x.5 or x.1) are more expensive and come tighter ranges (2.5 to 8.5 or 6.0 to 8.0 for example), while quality pH meters are even more expensive and require proper up-keeping. Any thoughts, anyone?

Oh, and I'll have more photos when things really start showing progress.