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

[Snufflupagus]

Originally Posted by Cal_stir

your salinity seems a bit low, what is your alk?, diatoms thrive on silicates, did you use any base rock that might be leaching silicates?

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.