Me and my mum are 'thinking' about getting a fish. But mainly I am just curious I have some questions What breeds are in general the easiest to keep, require the least care, and are good for beginners? How often should you clean out their tank? If you go away, what should you do - are there are forms of food than can last over a week period say? What equipment do you need - I know a tank, food, water treatment, gravel and plants - but I have heard about filters and heaters too? Thank you!