I wouldn't say taking the first one to the vet asap is necessary. Just keep it separate from the others, feed it as much as it will eat in crickets. If it gains weight then it is fine. The others might be hogging the food. Taking it to the vets will just stress it out when it isn't needed. If it doesn't gain weight, then I would take it to get checked out. The other three are fine. They are all normals, possibly high yellow I am not sure. If you get the temp nice and warm in their tanks (belly heat + ambient) their colours will come out even more.