I know I Need 300W Heater for my 40 gal tank, but I just upgraded to 40 Gal from 15 gal and I have 50w heater. so until I get 300w heater (after saving up money ~ 6 months), is that ok if I put 50w heater in 40 gal tank? it's winter and my tank is close to door, so temp might fluctuate a lot. I want to keep it around 75F for my goldfish.
Thanks......
Thanks......