Why isn't my coraline algae growing!

[FragIt Dan]

Originally Posted by Timbits

So i just remembered that the rock in the tank, i got it from some guy and he told me that it was from a medicated tank.... or something like that

Would that have anything to do with it??

That might have something to do with it, particularly as lockrookie said... if it was medicated with copper (I too would not use the rocks in a reef tank if this were the case). There are a multitude of factors that may be contributing to your decreased coralline growth. It is likely a combination of things. Your low dKh would likely be contributing as well.

As for Purple Up... I am under the impression that Brightwell Aquatics Elemental product is the same, so if you are not able to get one then try looking for the other. You will still need to maintain Ca, dKh, Mg lighting and flow, but using Purple Up or Elemental (will increase your Ca and dKh simultaneously but not proportionally) have been reported to promote coralline growth more than standalone Ca and dKh supplements, although you will likely still need to dose the individual components for fine tuning.

One other thing to note... although both of these products report to contain other elements (Mg, Sr etc.) they are in such low concentrations I would treat them as if they were not present.

[Timbits]

Originally Posted by FragIt Dan

That might have something to do with it, particularly as lockrookie said... if it was medicated with copper (I too would not use the rocks in a reef tank if this were the case). There are a multitude of factors that may be contributing to your decreased coralline growth. It is likely a combination of things. Your low dKh would likely be contributing as well.

My dKh is good and stable, it is not low. I'm getting growth on my corals, so do you think it is not copper? if it was another medication that was used, would it be ok?

[Reef-Geek]

Originally Posted by Timbits

Yes, KH is good. what did you dose to fix the problem? was your KH low before?

my kh was low, around 6-7. to me coraline will grow quickly if water if stable
I dose this and my coraline goes crazy.

[Timbits]

Originally Posted by shingo43

my kh was low, around 6-7. to me coraline will grow quickly if water if stable
I dose this and my coraline goes crazy.

Thx i mite try it