Thanks to all who replied to my first question. My next lot are to do with tank cleaning. How often do I clean the tank how do I do it (especially without disturbing the fish) and what do I use? Do I have to buy lots of specialist equipment, which sounds rather daunting, or are there ordinary household items I can substitute? For instance, I read somewhere on the net about using a credit card to scrape off algae. Once again, thank-you for your time Any advice on the matter gratefully received.