kH and pH and Calcium problems

[moppy]

I use Reef Crystals and have been pretty happy with them.

Water change every 2 weeks. Last one was last weekend. 20 gallons for the 120 gallons that I have.

Everything looks relatively happy although I seem to lose my torches/frogspawn kind of corals.

Salinity is at 1.025.

[Cal_stir]

Check this out.

http://reefkeeping.com/issues/2006-02/rhf/index.php

[Aquattro]

Something isn't right then. Reef Crystals is pretty high in Ca, and regular water changes should bring it back up to level with moderate consumption. Unless you have a tank overflowing with SPS that need trimming every other week, your Ca shouldn't drop to 300. Can you verify that number on a second test kit?

[moppy]

I did get it checked by JL and my readings were all correct...

[Aquattro]

Any noticeable amounts of precipitation on heaters and pumps? Or, do you have a huge amount of coral that is growing quickly?

[moppy]

No precipitation and no major coral growth (very little SPS right now)

[Aquattro]

I guess, at this point, measure it often and see if you can find a pattern. If it's 450 now, it shouldn't go down significantly before your next water change, which should replace any used up