dark

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?

Hi See my signature for tank details. My oldest ram, the female, hasn't been well since yesterday. I first notices last night that she was very dark and hiding about half way up the tank at the glass to the rear left corner. She was also pointing her body upwards so her head was pointing up...

Hi. My guppy have birth to 52 fry yesterday. (How exhausting!) all of the dry but one seem healthy and active. The one fry is darker in color, weaker, and spends a lot of time sitting at the bottom. Does anyone know why?

Is my mollie pregnant??? It is dark under neath but i got it from the pet shop afew days ago... i have a breeding box and i have put into there just incase, i have researched it and it seems like it is, can anyone help???