Hi. I have a tank which after installing the DIY background has come down to about 80L. I want to keep some Endler Guppies and Zebra Danio's in it with my Gold Fish. The tank is in the living room, sits at around 14 - 15 degrees during this Winter, June/July. It is lit with LED lighting so no heat coming from there. Also the polystyrene background protects it from the sun through the window. The room does have a heater on most nights but I am unsure if that actually heats the tank any. I was thinking of getting a 50W heater, but I would like to know how many hours in a day it is likely to be on so I can calculate the cost of running it.
Is anyone able to help?http://paine.id.au/images/aquarium.jpg