this should be put on fml.com what kind of fish do you know? if they are inexpensive get some new ones, tell her that you where cleaning up around the house (using a bleach cloth) and then you cleaned the tank...or just act completely dumb and leave all the fish in there and be act like you have...
I also have a 29 gal tank. I have 7 small tiger barbs and they are by far my favorite they are always on the move and petco has them on sale till the june 21, 5 for $5 great buy. Also get some goramies (sp) they are great colorful HARDY fish to start your tank. Enjoy!!! Get some hard plants too!