Tank crashing...could it be due to these?

[Son Of Skyline]

Originally Posted by Doug Lowey

Most likely correct Steve, however some interesting reading on lowering alkalinity and the reversal of RTN, by some very experienced sps keepers. Also, the theory, is backed up by many German sps reefers, according to the threads.

So what are these people considering as a lower, RTN reversing alk setting?