The RO/DI water that i use for my ATO, has not been tested yet. However the salt was tested this morning. 0.0 ppm Phospates.
As to the Tang, its a Juvenile 3 Inches in size, the 2 clowns are less than 2 inches each, the wrasse is maybe 1 1/2 - 2 inches, and the rest are cleanup crews less than...