No Algae

Do you have real plants Aquamaid? How are they doing?

Are you growing plants? Five hours a day would seem an awfully short time to give enough light for plants to grow well.

Most people complain about having algae, some people are just never satisfied! 

Whether it's a problem or not really depends upon the individual case. If you have fish or shrimps or snails that like algae, it's a problem if you don't have any. If you don't have any of these, it's not a problem unless you want some purely for the aesthetics.

I think it's the 5 hours of light which will restrict the algae. But I can't think many plants will thrive, except Java fern and a few other low light specialists. You wouldn't expect garden plants to do well with 5 hours of light and there is no reason why aquatic plants should do so either.

One tank won't make much difference, I have 10 running, though none are very big.

You need to know how many watts of lighting you have. 40 watts (it's probably less) would take 25 hours to use one unit of electricity, the cost of which you could find out from your bill if you don't know.

Heating will depend on the ambient temperature in the room where your tank is and the temperature in your tank. The bigger the difference the more you will use, but I find that in a modestly heated room my heaters only come on for a few minutes at a time. Unfortunately, half of my tanks are in unheated rooms.
Normal internal filters will use very little, about the same as one low energy light bulb.

i have four tanks i have algae problems
wish i didnt but mine is down to excessive
light i am going to put all mt tanks on timers
so i dont have to bother about switching them
on and off

means making some short lead up so i can connect them up  doh