Thanks for your help, guys - they're getting plenty of light, but I think my hermits may have been bugging them, picking at them and knocking the frag rock over (didn't want to glue them down until I'd light acclimated a bit. I pulled them up onto a frag rack and am feeding the clean-up crew as we speak.
pH is still at 8.0, despite the 2 gallons I changed last night, so I'll likely do another 2 gallon change tonight or tomorrow.