I`ve changed water in my tank in the morning without my lights, then I started with one neon light 18w (only to be able to see what is going on)... I saw, that lot of tiny bubbles were created under all leafs, after water change. "Pearling" started from all my plants including glossostigma...Plants with wide leafs, released much bigger bubbles. Ludwigia repens released bubbles that look the same like pearling. After 2 hours "pearling" was almost over. Then I put back on standard 300w and I had to wait about 3 hours to see real pearling.

I think that water temperature is having great deal in pearling after water change.

Next sunday I will chage with cold(er) wather to see what is going to happen...

Misa