I wouldn't reseal it. For a couple reasons, one is that resealing a tank is a sticky, smelly, pain in the butt. And not in a fun only on saturday nights way.....lol another is that you can't just put new silicone over the existing stuff. Silicone will stick to darned near everything EXCEPT previously cured silicone. Go figure. You would need to remove the old stuff and run new beads. Don't worry about the disclaimer that the sealant they use is not designed to be submerged, that is a cover their but disclaimer because their tank is cheaper than an aquatic tank of the same size and invariably some moron would buy it as a fish tank and flood their house, then sue Zilla. They do use 100% silicone, so it is safe. Post some pics of the build if you can, i want to pick up a pixie and would like to see how others set up for them.