Argh, do you not think i would have added a heater if i could??
I am not sure if i have already said in this thread or if it was the other threat, but i do not have any spare power outlets (and yes, i do use extention cables and plugs, and they are all used also)!
I have this 5 gallon sitting around doing nothing, and i want to do something with it!
...no, you haven't said in 'this' thread that you have no more power outlets available... (maybe I should have read all your previous posts beforehand to find out... not

...if you really cannot get another power outlet/extension cable/plug then you are limited to coldwater fish imo... not putting a heater in a tropical tank is unfair to the inhabitants... as they are purely at the mercy of your rooms temp fluctuations... you could 'cycle' the 5G as an emergency/quarantine tank to run alongside your main tank... but without a heater it's not ideal...