These "tetra tints" look exactly like my "austra whites" that I got from efowl.com - they are a cross between an Australorp & a white leghorn, and they are mostly white, single comb, and the chicks had some tiny black spots on them - they are are now about 8 weeks, and they have a bit of black/grayish splotches near the bases of their tails, but other than that, mostly white. They're supposed to be heavy producers of off-white or tinted white eggs. Wonder if these "tetra tints" are the same cross?
ETA: my very first chickens came from Mt. Healthy and they were awesome - some EEs and some...gosh, I think a production breed. The EEs were the largest I've EVER owned, and I've gotten them from 4 different hatcheries now.