looking for a lens for Nikon D3100

[tharsis]

Thanks for the compliment, I appreciate it

I agree about combining hobbies, I have always enjoyed taking pics of my fish and my tanks to share on this site and I would like to be able to do that with this camera.

I don't have very high standards at this point for quality of shots, so I need to get an idea of what you mean by blurry pics of fish. I have a canon powershot that has served me very well for taking close up shots of fish/plants, and I would like to be able to do that without having to buy a $300-$500 lens haha.

So the problem with this lens is the aperture size, not the focal length?

I guess I need to do some real research lol.