Camera Setting's

I have a H.P. Photosmart M525 that came with a computer I recently trashed when I built this machine. What are the best camera setting's for taking pictures in the home aquarium. I know it will vary from cam to cam and lighting is an issue also. So my light's are cheap Catalina 6 bulb T-5 if that helps any in taking pics. All of my pictures so far have a yellowish tint to them like this shroom pic here. It is an okay picture but could be better. And also how do you post picture so they are on the page and dont have to be inlarged like this way does?

 

Try using different white balance settings.