What is your cage temps?
Yes leave the uvb on all day long. They grow like weeds and need it.
If the cage gets to at least 80F, i would not use a basking light.
If the cage only gets to 75F, then you could install "a normal house bulb, not a flood" to heat "an area" to 85-90F.
Once they are sub adults, then you can install a "wide flood" that will heat an area to 90-95f.