Quote Originally Posted by rhizome
Nah, you can grow cyanos in yer res pretty easy- they present as a red greasy scum on the plastic that wipes off pretty easy. Never actually seen em do any harm. More likely @ higher pH- when I think about it, I've never seen em under 6.0.

That may be so rhizome......but it doesn't count unless you DREAMED this answer. :stoned: