shock

I find it quite unnatural to flick the fish tank lights off at night. I'm thinking that this could be a shock for the fishes as they can't see anything after that. Should I get dimmable lights and do it gradually? What's your techniques, opinions, experience about this?

I think I really messed up. My black orchid male betta has not eaten for the five days I've had him, and in the last two or three he has not been swimming a whole lot. I figured maybe he was lethargic and excessively weak from his lack of food, so I decided to move him to his cup and put food in...

My one Betta,Bert. that I had for almost 2 years , just died and we replaced it with another Betta last week, Swim Shady. Woke up today and Shady was dead. At 1st I thought it was shock and then I realized what killed him. Every time I fed him, I would just put in the pellets and walk away...