"Peter Pan" wrote in message . ..
to promote growth of Coralline algae, you can add
a product called PURPLE-UP. It does work; just not
over night, it takes some time.

How can you say it does work ?
I have never used it, but I have plenty of coraline...
Have you done two tanks test, one with, the other
without the product to compare how fast will it grow?

I would not promote product like this if I was not
sure if it really works... coraline grows fine in
every tank without any addition of "purple-up".
Just keep the calcium level high and water clean and
you will get it, without spending money on snake oil.