I certainly understand that you can't pick them up with the back and all, but can you tip them to feel the bottoms? I don't trust water meters without another confirmation method.
Are you watering to runoff and leaving the water in the trays to get soaked back up? And how often do they need water?
In terms of hunger (if it's definitely not a water issue), I'd give them 5.5g MC/gallon once and see what changes.
Are you watering to runoff and leaving the water in the trays to get soaked back up? And how often do they need water?
In terms of hunger (if it's definitely not a water issue), I'd give them 5.5g MC/gallon once and see what changes.