Quote:
Originally Posted by draco
i was told it is the most important with top up cause you are not taking anything out. where on a water change you are taking out so you can put the tap water back in. i dont know, but i have access to the RO water easily so i think that i will do my changes with it from now on. and leave it to cure for awhile.
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Whoever told you that one is just plain incorrect.
Just to be clear...
Evaporative top up - use RO water
Water change - use SW mixed using RO water.
Just don't allow tap water to ever enter the system. Plain and simple.
My $.02: I do 10% water change weekly using SW that I mix and use immediately after mixing. It's not the best procedure, but it has never caused me any problems in 3 years. In fact, due to the new SW being cold, the tank temp drops by nearly 2 degrees C each time I do it. Bad...but no dramatic effect like you are experiencing.