Nice results P,

Still, a good balance between light and Excel/like dosing is required to achieve a higher level of growth. You also have a substrate in there, and it has what in it?

This also addresses issues with red color, clearly less light and good nutrient supply can provide good color. Many do not believe me. But then they also do not try it either...........

It also makes getting such color and keep it easier in the process.
Careful dosing of the Excel etc can provide good results, it' has a 1/2 life of about 11 hours and should be dosed early in the day.

While the roots are growing well in the L perunesis, Hydrilla root formation is immediately arrested using Excel.

Regards,
Tom Barr