I currently have one of the hang-in-tank submersible heaters. It works fine but when I re-do the tank I want as little equipment as possible visible in the tank. I have a Fluval 405 canister filter. Can anyone recommend a good in-line heater? I saw a few on e-bay and the "buy it now" prices range from $40 to $70 dollars. I dont want to spend a ton of money but I want a good one. I also notice that the watt range was 110w to 350w. Does the wattage depend on the size of the tank? I have a 75g.