In that case, then its probably just the stagnant water and rotting moss that create the smell... therefore you'll have to change the water more regularly and remove the rotting bits of moss. It'll also be better if you are able to leave the container open all the time, the constant air circulation will help too.
You can put the container of moss next to the window (or at a location where some light can reach it), no need to be under direct sunlight. Also remember to rotate the container periodically so that the moss on all sides can get some light too.
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