have you bought a new cam since you took these pics? my old one was the same way with color, and it's pretty easy to correct.
http://www.freeserifsoftware.com/software/PhotoPlus/
just adjust the saturation till it looks like real life. dunno how close this is since i haven't seen your tank in person, but you get the idea...
http://i3.photobucket.com/albums/y53/gnx/DSC01584.jpg