Rock turning green?

[Tl52505]

I just got a new light for my betta tank because I noticed that the one that I had went out partially, I have had it in for a day and not one of my pieces of dragon stone is turning green. The only thing I could think of is it has a blue mode that is dim that I had on at night, any reasons this could be happening

 

[connorlindeman]

Algae. Too much light/nutrients.

 

[Colin_T]

it's blue green algae (Cyanobacter bacteria).

have white light on the tank. Fish don't live under pure blue light, they need all the colours so it looks white.

 

[Tl52505]

it's blue green algae (Cyanobacter bacteria).

have white light on the tank. Fish don't live under pure blue light, they need all the colours so it looks white

I only put that light on at night, should I just never use that one

 

[Guyb93]

I only put that light on at night, should I just never use that one

I wouldn’t use any light during night , fish do need periods of darkness