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I tested ammonia in the past, but stopped doing it since it didn't give me any bad result. The testing tools seem expensive too. I thought as long as I keep the water clean with a good filter, I wouldn't have to worry about testing water. It seems that keeping an aquarium requires more effort...

Correct, I've never cleaned it since I set it up because I didn't find any suggestion from the manual, so I waited until it shows some signs of need. Thanks for your reply. It's very helpful since I am new to aquarium keeping. A friend gave it to us when he had to move abroad. BTW, I am...

How often and what part do you change? I also use Cascade 500, set it up since February 2010, on a 25 gallon tank and it has been running beautifully. But for a couple of days now, the water has become unclear, and I think it's time to do some cleaning and change some filter parts. I refereed...