Algae ID

[JohnnyReeftank]

It is used rock....buddy said he had it in his system for 5 years and it was covered with growth...not to mention every bad hitchhiker out there...couple red flags I guess

My N03 and P03 both show zero....but it might be because the algae is sucking it up so fast......should I try phosphate absorbant like Daniella said??

I actually just got my RO/DI on boxing day so I've only made 1 water change with it....I've been using store-bought RO water from a local water store for the last month and a half and before that I was using tap water and prime.

I've got my 2 actinics running 14 hrs and all 4 bulbs running 12 hours a day....is this light period too intense?


......a couple before and after pics of the same rock