If you want her to have a large family, you could encourage good eating by hatching some brine shrimp and giving it to the fish.
They are very easy to hatch, and teh fish go bonkers over them.
The Magnum micron cartridge does a great job polishing the water, no other filter comes close (expect for those diatom. earth types). Great flow rate too. But for the everyday stuff, the Aquaclears and Penguins are a good buy.