08-31-2009, 05:01 PM
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Most say it will not harm the fish if overdosed; it is just wasting money, so it's best to figure out once how much you need and then you're all set each time.
I haven't "measured" conditioner for more than 12 years. Like Herky, I buy the gallon jugs (it is much cheaper by volume, believe me) and fill the smaller bottle that has the squirter top so its easy to use. I usually change 40-50% each week, and I'm talking 70g, 90g and 115g aquaria. When I'm ready to refill, I go to the faucet, adjust the temp (can't waste hot water syphoning out the tank water) with my hand from a small container of water taken from the tank, usually get it just a tad cooler, then switch the valve to fill the tank. When I get back to the fishroom, I check the temp of the incoming water just to be sure, then add a little squirt of conditioner (I use Kordon's Novaqua) in front of the tube, and go on to something else with that or another tank. About half way through the fill I give another squirt.
Some of the fish continually swim in the stream of incoming water, and none have ever showed signs of stress; and I'm sure they wouldn't swim there if it was burning their gills. Any my water here is heavily chlorinated.