dalmatian all of a sudden doesn't like light

[terricc]

Hi Folks, I am very new to this site as well as to the fish world. I have a 10g tank with swordtails, black mollies and dalmatian mollies. There for awhile I had a problem with the nitrite being to high. I now have that fixed. Now my problem is that 1 of my dalmatians does not like the light, and even when I turn the light off he stays at the top of the tank. Have I done something wrong? Any and all help is appreciated. Thank you.

 

[_Drago_]

It's very unlikely to have to do with the light. What are your parameters? How many fish do you have in the tank? It sounds to me that it's possible your tank is overstocked. If you can answer these questions it will help us to better fix the problem!

 

[terricc]

All the parameters are at zero. There are 9 fish total of different varieties.

I did turn the light off a couple of hours ago and now the fish that I thought didn't like the light is now moving around as if nothing was wrong.