Hi friends...
I was a bit away from the forum lately because i need to settle some things like find a job and get on earning some money !!
But i was thinking in moving my "fishroom" to an actual closed room with a door where i can keep heat in and heat the room instead of heating each tank...
...Hopefully i will be able to increase the number of tanks without having a lot of arguments about heaters and their running costs heh... 
The idea came because my dad had a coldroom and he's moving from a place to another so now i've got an empty "coldroom" which i can use as a fishroom and which will help me even more to keep heat inside... Obviously it won't be a coldroom anymore it becomes a "warmroom"
Still got a lot of things to settle like the wiring etc before i begin moving... but one of the main things that i'm not settled about is the door.
This room has a door that completely seals the room and only a small hole is left open (which was originally used for condensation to drop through)
It is a good idea to leave such a door ? Or it's better to make a sort of curtain that will be kept firmly with velklor which has double sided tape...
I will post some photos when i have some chance so that you will have a better idea on what i'm talking about...
Any suggestions are more than welcome friends... and if you see any wrong thinking please warn me about it, thanks 