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+1 Andy
I would use the water, why wouldn't you? Its a waste, not to. The reason we don't do 100% water changes is for stability.
I've owned a Lifereef overflow box for almost 10 years and NEVER had a problem. That said, I would prefer to have a drilled tank though.
[img] $25 per skimmer one is 24" tall other is 18" tall no pump located in Bondurant
I have a shut-off kit F/S comes with float, auto shut-off valve. $20 Bondurant, Ia
Rockin/large
The problem with adding lime (kalk) is that it will boost the pH and alkalinity too much, causing potential precipitation of calcium carbonate,...