Here is an example of a dimmer for you light. Lutron TT-300H Credenza 120 Volt 300 Watt Single Pole Lamp Dimmer You could also get a 25 watt incandescent red bulb.
Soaking seems to lead to defecation which is good for everyone... : )
Yes, feed at night.
I wash my hand thoroughly and then rinse and then wet them with dechlorinated tap water before handling and keep handling as brief and limited as possible.