Howdy davel160, The leaves look rather yellowish and not as green as they should be, the stigmas (so called pistils) look OK. What is the reservoir water pH and temperature? You could be having a calcium and / or iron deficiency, either due to pH problems or due to just not enough there for the plants. If the temperature is too high (should be between 62° F and 70° F) algae could be growing causing an unbalanced pH as well. I would recommend checking both to see if they might be causing the leaves to be yellow.