Sharon,
do me a favor if you still have that water mixed, bring the SG up to 10.264 and test the Ca and Alk, you can test the Mg but I am sure it is not going to come up to the new RC #s, but I am curious if the Alk and Ca do. What size container of RC was thet from? even if that is a 50/50 mix of Red Sea and RC those Mg #s are about 30% lower then you should be getting. Did you have the LFS test it yet?
do me a favor if you still have that water mixed, bring the SG up to 10.264 and test the Ca and Alk, you can test the Mg but I am sure it is not going to come up to the new RC #s, but I am curious if the Alk and Ca do. What size container of RC was thet from? even if that is a 50/50 mix of Red Sea and RC those Mg #s are about 30% lower then you should be getting. Did you have the LFS test it yet?
