Dark thick growth like this customer's SURF2 or 2x is loaded with removed nutrients from the water, but must be harvested more often because it detaches easily. Stronger lights would have grown a lighter color:

Click image for larger version

Name:	DamienKwok-1.jpg
Views:	1
Size:	97.5 KB
ID:	7481 Click image for larger version

Name:	DamienKwok-2.jpg
Views:	1
Size:	78.4 KB
ID:	7482





16