No, heater starts working immediately. What I did was, I gave my fish tank a full cleaning and added fresh "temperature controlled" water and then added heater. No adjustment needed. Stays at 78 degrees always.
answered 1 year, 11 months ago
Augusta, GA USA
1out of 1found this answer helpful.
It starts working immediately and should have the tank depending on how cold the water is heated to your settings within 30- 12 hours changes will take place slowly. If you have a ten gallons changes happen fast if you have 100 gallons things take longer.
answered 2 years, 2 months ago
2out of 3found this answer helpful.