heater

We be poor people so I've been looking on amazon for a heater for me and my son's 10 gallon. Any suggestions? If it can stick under $20, I'll be happy. I would like to see what other people would suggest before I add one to my wish list. 

Hi, okay so I got a new tank from my friend, which has been up and running for a couple of years, so don't need to worry about nitro cycle and stuff, I love fish! I am studying to become a marine biologist and am in year 11 Measurements are: L 58 H 30 W 30 52.2 L tank 13.789 gallons It came...

all - in a 37 gal tank with one 200W heater - how close should / shouldn't it be, to the filter?  Thanks in advance....

This is a great heater. Very accurate, with a digital thermostat as opposed to the traditional bi-metallic strip design used in nearly all other heaters, this means it's accuracy doesn't decline over the years as the bi-metallic strip very slowly degrades.  The other two benefits of this...