electrical

hey everyone, My landlord has come over and we are due to have some electric works being done in the house and the power could be off for 3-6 hours in a couple of weeks. I will need to keep the tank warm and oxygenated. Any tips from anyone who has had this sort of thing before? Thanks

What are ec levels what does it affect and what are dangerous levels even if it is dangerous to fish, I know it's to so with the amount of positive ions in your water but how does it affect fish and what is ec in detail?