hi, im looking to buy a new camera. the main purpose for it, would be to take shots of my tropical fish. this will include close up shots, and, of course, it will be through glass with a light overhead. im not sure what is the best one to get. my budget is £100 absolute max, though, i have no problems saving by getting a second hand one if needed. can anyone help me? i need one asap, as ive got baby's i want to shoot and share with my online fellow hobbiests.