We have a fishy smell in one room in our condo. It's not a dead animal smell, sewer smell, mold smell. We haven't yet moved in so it's not electrical related. Strongest on sunny days -- will abate in the evening. Closing drapes, though, doesn't make a difference (smell also not coming from window). Not coming from heating/ac vents. Have sniffed every place I get can my nose to go and there seems to be no source for the smell. Room was painted in summer. Also new wood floor laid. But neither seem to "smell." Help!