Canon PowerShot pics suck?

[MikeP]

We have an 8.0 megapixel powershot S5 IS. I thought this would take some nice pics of my tank, but my old 3.2 megapixel powershot took much nicer pics. I thought the S5 would be a much better camera. Is it me not knowing how to use the camera or does anyone else have issues with this model? My biggest problem is trying to take nice detailed close up shots of corals. Anything close up actually. Can someone educate me or confirm that this camera just doesn't work that well for aquarium pictures.

Thanks