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Hi Tobias,
I don't worry about matching the tank temperature so much as being close. Since I usually change about 20% of the water at a time if I am a few degrees off the effect on the overall tank temperature is minimal. In fact, I try to fill with water a few degrees cooler than the tank temperature. A lot of times a temperature change stimulates breeding activity, especially in my Corys and Angels. In a way, cooler water simulates what typically happens in nature when it rains. That said, I certainly wouldn't add ice cold tap water to a 77 degree tank for fear of triggering an outbreak of ich.
I don't worry about matching the tank temperature so much as being close. Since I usually change about 20% of the water at a time if I am a few degrees off the effect on the overall tank temperature is minimal. In fact, I try to fill with water a few degrees cooler than the tank temperature. A lot of times a temperature change stimulates breeding activity, especially in my Corys and Angels. In a way, cooler water simulates what typically happens in nature when it rains. That said, I certainly wouldn't add ice cold tap water to a 77 degree tank for fear of triggering an outbreak of ich.
