I have usually checked alk in the evenings. I tested tonight and it is now up to 9.5.
I have never gotten a tingle in the main tank but occasionaly I get a tingle in the sump if I have a cut on my hand.
thanks
Jeff
I can almost guarantee that when you removed your substrate you released something toxic into the tank(the chemical name escapes me at the moment, but it is sulfuric and deadly) forget the stuff that builds up, but it is highly toxic.
I did the same thing a couple years back, killing huge sps colonies.
Water changes and gfo will help slow the process.
ever figure it out or beat it?