Removed the substrate in the tank and replaced it with cleaned gray slate. Saw an immediate change in my frogs' colour and activity. Bought three new ones today.
Introducing: Squishy, Sushi, and Classy.
Also making an appearance: Hugo and Hermes
edit: I was a little concerned with Hugo's social skills. As soon as the three newbies entered the water, Hugo stalked them with what seemed like an evil attempt. After 5 minutes of getting used to having them in the tank, he mounted all three of them, one after the other. What a guy =P I think he is going to do just fine.
Here are a couple older photos of Hugo and Hermes before the new additions:
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