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I've had goldfish In my 30 gal. tank for 5 weeks now. It has a filter, and I put de-chlorine drops In the water. I clean the grave and do water changes once a week. The only thing I don't have Is a heater(bad for the goldfish), I was wondering If my tank has been 'cycled' and Is ready for tropical fish once I find my goldfish a new home. And what exactly Is 'cycling'? Does It mean all the water has gone through the filter and has been treated with de-chlorine drops? I seen talk about algae, does there need to be algae In the tank for the new fish? I honestly don't see ANY algae anywhere In the tank. I'm a beginner, so I'm sorry If I'm asking too many questions. But I so appreciate your opinions. Thanks!!