Bill,

I recently made two planted tanks. On neither did I rinse the gravel
enough (it seems) (though I did better on the second). On the first,
6g, the water was chocolate milk. I hooked up a Magnum 350 canister
filter with both the "fit right" sleeve and the pleated "micron
cartridge" - I don't know if this is the same as a diatom filter, but
after a few hours, the water was clear.

On the second tank (2g), the little filter inside (50gph?) did the
trick itself over night.

FWIW,

Liz