07-22-2008, 06:29 PM
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Most of that stuff is hard to overdose. Not that you should run around dumping it into your tank, but don't worry about being too precise.
However, if you want to be precise, add 1/4 tablespoon for every 25% water change (25% = 1/4, get it?). For a 10% change you would want to add 1/2 ml which is kinda annoying to measure out. Just do your best, or use a heaping 1/8 tsp if you have it.
As for waiting, you should be fine to add the water to the tank right after you use the conditioner- the chemicals will have worked. However, some people's water chemistry changes drastically when it ages/aerates, which can be stressful to your fish if you're doing a major water change. You may want to test the ph of your water right out of the tap and then let it sit for 24 hours and test it again. If there's a big swing, it's something to think about.