for those of you with normal tropical fish, what temperature do you keep your tank at? i just keep mine at 78F.
Installing a proper aquarium heater in your tropical fish tank is essential for the well-being of your tropical fish. You should check the water temperature every time you visit your aquarium as part of the routine in order to notice any problem or malfunction in time. The electricity bill will only be a few bucks a month, because the aquarium heater will not be always on. It is absolutely worth the cost.
As a good starting guideline your tropical fish tank temperature should stay within a range of 22 to 29 degrees Centigrade, 72 to 84 degrees Fahrenheit. Some species of tropical fish require much narrower temperature ranges in the 24 to 25 degree centigrade range.
Freshwater aquarium - Wikipedia
What is the ideal temperature for fresh water fish tanks? - Quora
Fish require proper water temperature control to stay alive and healthy in the fish tank. You must keep in mind that the necessary water temperature differs according to the type of fish you have. There is no need to keep the water at a high temperature if you have freshwater fish. On the other hand, if you have tropical fish, the water should be warmer and in the case of saltwater fish the temperature should be even higher yet.: Guppies are from tropical climates so your tank needs to be of tropical temperatures. You need a temp of 75-80 degrees Fahrenheit. It’s very important to have the correct water temperature for tropical fish. You may be able to hold down that water temperature if you live somewhere with warm weather. If you need to buy a heater, figure on needing 5 watts for every 1 gallon of water in your aquarium. You said your tank is 5 gal so that means you need a 25 watt aquarium heater.*Awarded Answer
Your aquarium does need a heater and I’m surprised you have gone this long without one. Guppies are tropical fish and the water temperatures need to be in the mid 70s at minimum. I imagine your fish are starting to be put under stress from it. Guppy fish call out for tropical water conditions of 70-78 degrees Fahrenheit. If your tank isn’t within that range constantly… then you need a heater. I’m trying to hold back on being mean, but you need to better research your pets before you just dump them into a habitat. Your fish could easily die from a variable like this that you neglected to follow. When buying an aquarium heater, figure on 5 watts per every gallon of water in your tank. So.. you said your tank is 10 gallons, that means the heater needs to be 50 watts. Local fish stores overprice heaters so I suggest buying online. Here is a .Freshwater fish tanks need heat or not according to the type of fish being kept. Cold-water specimens don't require a heater, but not all freshwater fish can survive in cooler waters: some freshwater fish are tropical or sub-tropical. The tropical fish require heat to survive in temperate regions and the sub-tropical ones can live in cooler water as long as it never gets too cold.