Diatoms...problem just won't go away.

[Cal_stir]

Originally Posted by Snufflupagus

I just got a new Hanna Alk tester, I will test today and let you know after I test. Sorry I don't know the term base rock. If base rock is dry rock to start, then yes I did and yes it is probably producing silicates.

Base rock is rock used at the bottom of the tank that the live rock sits on, it's not usually live rock and might contain silica.
Dry rock is OK if it is reef rock