Hello, Kay.
I have the exact set up as you do with the same 4 toads in 20gal Long. From the sounds of it, you have the viv set up well. I asked my vet about the green coloring. According to him, and everything I can find in research, there are 100 different reasons why they may be dark green.
Genetic coloring, like my Oscar
Shedding time...Cold...poor diet....stress....night...day...etc, etc, etc
From what I can tell and what the vet said, if all else is well, dark green color is nothing to worry about. Watch for appetite changes, lethargy, sores, weight changes, etc. If the toads are sick or over stressed they will exhibit other signs of poor health.
I noticed that mine are usually light green in the day time, especially early morning when the sun shines right in their tank. At night they turn dark green and almost blend into the rocks. Sometimes I cannot even see them against their driftwood pieces until they move or something.
Watch for signs of sickness and if nothing.... don't worry. Good luck with your babies.





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