Maybe add another filter, take out a couple of cups of water a day and stir up the waste so it goes into the filters more easily, and skip WC's altogether? You could try using bottled spring water, too...
Hey pink, what did their eggs look like?
I've got 6 pygmy corys in my tank at work and I suspect they're laying eggs. However, I haven't found any fry but that may be b/c of the other fish in my tank. I have enough plants/moss in there that a few should be able to survive.
I've been finding eggs in the silicone on the corners of the tank, random parts of the glass, plants and my driftwood. They look like sesame seeds.