It came after the move so I could bet a dime on that it has something with the move to do. I wouldn´t bet more because maybe the smell was there before and nobody noticed it.
Anyway - what happened in the move? Did you clean the owerflow? If the waterlevel is lower now it might be dead algae or bacteria fouling there. If the tank has a rim upside it could be dead bacteria there. I rinse such things with a new kitchen sponge, well rinsed. A bucket tap water beside to clean the sponge.
Anyway - what happened in the move? Did you clean the owerflow? If the waterlevel is lower now it might be dead algae or bacteria fouling there. If the tank has a rim upside it could be dead bacteria there. I rinse such things with a new kitchen sponge, well rinsed. A bucket tap water beside to clean the sponge.