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Add the appropriate amount of prime (usually doseing for the whole tank volume not just the changed volume) to the existing water then add the freshwater to the tank. This is how I would do it if doing a 50% water change.

Hi mate welcome aboard, good on you doing your research. The KH of my tap water is 1 KH, Gh is 2 Gh or something close to that. Personally it has never caused me any problems. I did add a Gh booster to add more Gh for a while and it did improve certain plants no doubt, ferns and crypts in...

Lads, ladies etc I'm going to close off this discussion as its getting somewhat wayward. There are lots of interesting views here over many pages, more than enough IMO for the individual to make up their own mind one way or the other on this topic. If anyone feels they need a right of reply...

I used to use it all the time and then I stopped for a year or so, I would let the water sit instead if possible but not always, but then recently I had some fish deaths after water changes (I very very rarely have fish deaths usually fish jumping out of the tank or something silly like that) so...