Partial Water Changes for Angelfish?

I just bought a tank, and I have two angels in it, and I have to do a partial water change. I have a siphon, and dechlorinator, and cycle, and I know how to do the change but...


I am confused about the water temperatures! I have had the water I am going to replace 25% of the tank water sitting out for a day, and it has been dechlorinated with "aqua safe', too, but it is still only room temperature, and my tank it like 78 degrees! Won't the colder water shock my fish?? Help please!


Thank you so much!!


Lily

Partial Water Changes for Angelfish?
Depends on the size of the tank. Say a 29 gallon with a 25% water change, keep in mind the water is not freezing and not near room temperature. It still would be safe to add the water.





But, if the tank is a 5 gallon, and you do a 25% water change, that has a possibility of shock.





The 29 gallon has alot of water to dilute the temperature of the new water coming in, but the 5 gallon doesn't.





And as long as your not getting freezing or really cold cold water from the tap, shouldn't put your fish into shock.
Reply:I always play it safe. keep the water change less than 20% go over that only if you think there is a disease floating around in the tank. if its just general maintenance then 20% is more than enough. plus this much change won't affect your fish.
Reply:add it gradually and it shudnt to bad as long as u dont add all at once.