could POSSIBLY have just been on the opposite schedule u thought. They seem pretty simple but I've more than one time set my timers to come on at 8pm instead of 8am lol.Bad news. Although i tested the timer, when i came home my lights were still on so basically the timer failed me. Fish went 56 without a dark period. I have shade and a hollow wood piece that the glass cats hang out in so i think they had enough shade and they didnt seem stressed or acting weird. Hopefully everything will be ok. I dont see any algae and i hope it stays that way. I will be getting a better timer today and start using it daily.