No I would leave the other filter in the fishless cycle tank.
When I say a bacterial med I mean anti internal bacteria med by interpet, it's for bacterial infections.
Woo Hoo, they are definately better now, I went to do a gravel clean and filter squish yesterday and noticed two pinkies - so mum and dad are "happy" again.
Don't know how many as yet it was their first day out - will post with piccies later.........
If you have fry better off putting some netting over the outlet tube with a rubber band to stop fry getting sucked into the filter.
Congrats on the fry.