How good do you want the resolution Chris? I have a Canon VB series webcam (used more for video / security surveillance than anything else) that works really well. Pan / Tilt / Zoom etc - works well in low light too. You can set the camera to take pics at certain places in the tank at different times during the day for coral growth sequence. You can access if from anywhere in the world as it has it's own built in web server. It has to be hooked up via ethernet cable but it works REALLY well. They are fairly pricey for a webcam but it just depends on how much you want it to do. Hope that helps.