Can anyone here help me? I am interested in buying a decent microscope --not just to look at algae but other cool things floating in our tank with the kids. But I have no idea what to look for. I was thinking of buying one on ebay maybe for $200 or so, or from a mail order, but I need advice. What should I be looking for? How do you tell a good microscope from a bad one? What are the good brands?