It depends on the species, but in general, tropical fish are most healthy in the range of 75-80°F (24-27°C). Cool water fish do better in temperatures below that, usually between 60° and 75°F (15-24°C), but some of them enjoy water well below 70°F, which is not suitable for any tropical fish.
Is 85 degrees too hot for tropical fish?
The preferred range is 65-85°F (18-29°C). At 95°F (35°C), bacteria die, which can lead to ammonia spikes. Lower temperatures cause the bacteria to become less active and can even make your aquarium take longer to cycle. As you see, it’s pretty important that you keep your aquarium at the correct temperature…
What temperature kills tropical fish?
Once again, they become more susceptible to disease, and in extreme cases, they can experience organ damage or even suffocate. Making matters worse, above 90°F, the beneficial bacteria that maintain balance in an aquarium begin to die, creating the potential for dangerous ammonia and nitrite spikes.
Can angelfish live in 70 degree water?
Scalare Angelfish Care (Pterophyllum scalare) They need lots of space to swim and hide. Temperature: 70 to 85 degrees F. They do prefer temperatures on the higher end of that range of about 76 to 80 degrees F. If they feel a chill, they’ll stay closer to the water heater rather than swim around the tank.
Why do tropical fish die suddenly?
Overcrowding is a common fish killer. … Even if you don’t have too many fish in your tank, adding several fish at once can cause ammonia levels to spike and such a sudden and dramatic change can kill the fish off quickly when they run out of clean water to swim in.
Is 81 degrees too hot for tropical fish?
Heat can become a problem if it is markedly elevated for a considerable period of time, which might be possible during a prolonged hot spell. The Angelfish, Guppies, Mollies, and Silver Shark, will have absolutely no problems with a water temperature of 81 degrees Fahrenheit, or 27 degrees Celsius.