LOL! Photoshop isn't easy to work the photos in because it is an almost sight unseen process until you tell it to apply what you're applying. If you've never done it before, it can be daunting. But hang in there! You'll probably know more than I about it when you're done learning.
Do you have a polarizing filter for your camera and a flash? A polarizing filter
can cut through glare if that's a problem. The flash is a must in a lot of instances. What brand and model camera are you using? Thank god they don't need film, huh....
Go to Home Depot and get a chrome t-8 shop light and two full spectrum daylight tubes to put over your aquarium. You should have plenty of light then and they don't give the ickish green overtones most fluorescents put out.