Question on PWC.

[Wayne487]

Only a certain amount of calcium can be dissolved into water at a given time and this isn't a dangerous amount to fish. If it really bothers you just heat some of the water to boiling on the stove and mix it. You will find an amount that brings it to the right temperature eventually.

Either that or get a garbage can and keep water in it with a heater and bubbled to keep it at the right temp.

Over time could it become a dangerous amount though? If I'm doing a 30-40% WC each week would it build up enough to harm them?