Well, light is good for the fish and plants of course if you plan to have those.
I turn the light on in the am when I wake up and then turn it off before I go to bed.
So I guess the light is already on when I feed them their second feeding.
I guess they are conditioned to see me walk towards the tank and expect a treat. I don't feed oranges and peas as a meal but rather as a treat so sometimes I feed 2 meals and a snack? LOL!
Who can resist a begging goldfish?