For a 29 gallon tank, which is best to get when it comes to stealths?
100W - 10 in. - up to 30 Gallon
or the
150W - 13 3/4 in. - up to 45 Gallon
to be honest I'm really afraid of coming home to see my fish all fried out, from what I've read and such it just sounds awful

I don't wanna get anything that'll be too much for it. Any tips I should know when it comes to having a heater?