Hi Another newbie here. I purchased a tank with 2 goldfish about 6 months ago. One died yesterday and quite frankly I am surprised he lasted that long. I clearly have a lot to learn. I have a filter running - I think it's a big one for the size tank. Is it possible to have too powerful a filter for a tank and if so how do I know what size it is and what size is appropriate. I have been doing a partial water change every week or so but really know little else about what I need to be doing in terms of general maintenance. If someone could briefly explain the basics to me I would be appreciative. Additionally I have read on these forums that a goldfish isn't really suited to this size tank but I already have him so want to know what's the best course of action from here. Thanks for any help.