your plants are suffering from heat stress.....10 inches is to close for a 1000 watt dual arc bulb at this stage... move it to 24inches. a ph of 5.5 is to low for soil......... raise it to 6.2-6.5 gradually . ocean forest does not have clay balls in it but i see them in your pics.....did you add anything else to your mix or water that u forgot to mention ?