Elaine T wrote:

I thought I'd never see anything pearl in my plant tanks since I'm using
Flourish Excel rather than CO2. This morning, the sun was shining on
the guppy tank, and the Baby's tears and Rotala indica were both
pearling in the sunlight. What a beautiful sight!


I used to get pearling from my swords when the sun shone through the
blinds. That was before I fertilised or even touched CO2. Sun definitely
has the oomph.

Nikki