Hi everyone, I am returning to the fishkeeping hobby after several years away and am jumping right in with a 55 gallon fw tank. I would like to create a well planted aquarium but I have no experience with live aquatic plants so I am learning as much as I can prior to purchasing the equipment. I am considering an undergravel heater and would love some opinions on those. They aren't as easy as the common submersible heater but I have been reading that they are good for live plants. My concern is replacing it if there is ever a problem or having it pop up from the gravel. An opinions on these?