Do i require a heater

I am having a tank of 16.83 US gallons of dimenssions as follows
leangth = 18 inches
breath = 12 inches
height = 18 inches
I want to know weather I will require a heater for my tank as I am keeping guppies, mollys, noen tetras, zebea danios and sword tails

 

What is the lowest ambient air temperature that the room will get down to with that tank?

 

What is the lowest ambient air temperature that the room will get down to with that tank?

the lowest ambient temperature would go upto 24 degree celcius and in worst consditions upto 18 or 17 degree celcius

 

So from math I just did your ambient temps will run from 62-75 degrees fahrenheit. This temp is too low for most of those fish or at least the bare minimum for these fish. I recommend an adjustable heater so you can better regulate the tank temp during warmer and colder weather.

Guppies 74-82
Molly 75-80
Neon Tetra 70-81
Zebra danio 65-75
Swordtail 78

 

So from math I just did your ambient temps will run from 62-75 degrees fahrenheit. This temp is too low for most of those fish or at least the bare minimum for these fish. I recommend an adjustable heater so you can better regulate the tank temp during warmer and colder weather.

Guppies 74-82
Molly 75-80
Neon Tetra 70-81
Zebra danio 65-75
Swordtail 78

thank you will consider your valueable suggestion and will buy an adjustable filter within two days

 

Here is the table to help with what size individual heater you need. Delta T is the difference from the lowest ambient room temperature in the room to your desired tank temperature. Always get a heater larger than you think you need so just round up to the next nearest size.

You state 62F is the lowest for your tank. Your Delta T is about 15.

 

I wouldn't get anything more than a 50 watt personally, I think the hobby goes overkill on heaters.

 

Depends on how quickly the ambient temperatures change. For quicker changes and a smaller tank I'd rather overpower heaterwise, for a big tank and slow changes below the usual watts.

 

You might also want to get 2 heaters of smaller temperature and use them both in case one fails

 

Thanks to all for their valuable suggestions