So I know from reading that WTF are active mostly at nighttime, and since the lights will be off in the tank i was wondering if putting a very small black light at the top of the tank shining in to see whats going on would be ok? is the Purple light the black light would give off bad for the frog or damaging at all? And if it would is there any other type of light that would be ok to use at night not all night long but i mean to see better into the tank.