Can you measure dissolved oxygen? If so check it in afternoon, report DO reading back here. Also take temperature. I can find somewhere around here a sturation chart. If at 16-18 inches if phyto bloom it will 140% or higher. I have a % saturation on my meter but this is best way to tell if color is from something non photsynthetic producing.

Jake you just need to get the water solube fertilizer from us when you use the last of that liquid. ;\)

Greg Grimes
www.lakework.com