On Tue, 18 Aug 2009 19:31:55 EDT, info wrote:
I've never done a partial change. Top ups for evaporation, that's all.
Proper filtration is the answer.
Except filtration won't reduce the stuff that builds up. Nitrates and salt
for example. San Diego Joe
And I'll add, hormones, parasites, bad bacteria. Plus the fish need more
than an occassional top off to replace the minerals in fresh water. ~ jan
Zone 7a, SE Washington State