Philodendron has worked well for me, granted it doesn't grow very much. I've got this purple/green plant of the genus Tradescantia, fast growing and loves having wet roots. I'm trying a variegated Ivy I rescued for a dollar from Lowes, so far so good with wet feet. I've got some living basil from the grocery store, so far it is doing well with wet feet too. You might also look into "aquaponics" for plant ideas that work good associated with Fish tanks. A balance has to be struck for most plants, if too much of the roots are submerged they will rot.