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Tips for adding a heater to an aquarium with fish already in it?

I have a 5 gallon aquarium and would like to add a 50 watt heater for the winter, as temperatures are already starting to drop. However, I already have my three fish in it. Is it safe to add a heater while fish are in the aquarium, and does anybody have any tips on how I might go about it?? Thank you! Sorry! They're danios. Definitely tropical fish.

Public Comments

1. First we'd need to know what kind of fish you have. If they're goldfish they absolutely should not have heat.
2. Assuming these are tropical fish, adding the heater is not a problem. It is not an instant heat situation where the temp will change drastically in a short span of time. Aquarium heaters take a bit of time to get the temp up to whatever you've got it set at, so adding it while the fish are there is not going to create an issue. Good luck. :)
3. Just add the heater! if it is preset for tropical fish like mine than its great, if not, then set it to the correct temperature, that shouldnt be a problem at all.
4. Set it to the correct temperature and put it in simple as that.