Eridu, didn't quite get what did you mean that advice should be rewritten.
i never specified that UVB in African Bullfrogs are to be used for better coloring, it is needed for their metabolism.
here there is a study on UVB usage for frogs.
https://aark.portal.isis.org/researc...tamin%20d3.pdf

summary:
Amphibians vary very highly in their exposure to UV
-B. Amphibians include nocturnal, fossorial, or aquatic
species with large variations in UV-B exposure.
These vary from almost no exposure for fossorial
amphibians or those that live in water more than 10
cm deep, to very high amounts for species that sun
bask in during summer in temperate or tropical regions. The requirement for metabolic Vitamin D
3
and the
ability of UV-B to promote the production of Vitamin D
3
in amphibians probably positively corresponds to
their exposure to UV-B. Consequently, some species
may have very low or no requirement for UV-B and
low requirements for Vitamin D
3
from their diet. Others may have ve
ry high requirements. Knowing the
patters and the amounts in the requirement for Vitamin D
3
and UV-B exposure

between species from
similar micro-habitats could help prevent hypervitaminosos