looks like you could have a couple of issues here one PANDA POLY reflects light so wel it will make Hot Spots use a thermal meter to see if this is happening, yellow could be an indication of magnesium deficiency epsom salt deluted mixture you read about it ... read about EMO effective microorganisms learn to mulch and grow your own in fresh water fish emulsion by creating a 1500 gallon stock tank for fresh water fish shit and pond bottom nutrients get serious stop using clorinated salt water nutrients.........by the color of green........oh and read about atomizing your emo as well as using the head yeast for mulch activator create an increase of CO2 inhibits mold growth oh and then there is cordeceps the fungus that turns pests into nutrient for the soil .
