I was looking at getting a heater for my tank since it is going to start cooling down outside soon and was thinking of an inline heater. After a google search all I could find was hydor inline heaters. Are they really the only ones making them? Or am I blind and missed something? They seem to get a lot of good reviews but I dont really like not having any other options of inline heaters to choose from. My tank is 140 gallons so I'd most likely need 2 of them from what ive been reading.