The red light is ONLY for night viewing, white light is appropriate for day (I use 50/50 actinic, Jean (New Zeland) has seen some octos object to blue but I have not had a problem with any of the Caribbean species). Hummelincki is a daytime (diurnal) octopus and should be sleeping at night which is why I recommend lights off for night - sorry if I was not clear. You do not need a red light at all but if you want a light on at night use red.
If you look at most of Beldar's pictures and the mercatoris pictures (except at the end of their lives when their sight was no longer impacted) you will see the red lighting used 24/7 but these are nocturnal (awake at night) animals. SueNami is crepsecular (early morning and early evening) and we use a red flashlight (the red night light died) when interacting with him at night but use regular lighting when he is active during the day.
If you look at most of Beldar's pictures and the mercatoris pictures (except at the end of their lives when their sight was no longer impacted) you will see the red lighting used 24/7 but these are nocturnal (awake at night) animals. SueNami is crepsecular (early morning and early evening) and we use a red flashlight (the red night light died) when interacting with him at night but use regular lighting when he is active during the day.