right lets see if this works then. the end is me trying to show how square the light is with the gt. was pointless lol. ive got another light there too. would now be a good time to put that up? was thinking about angling them in from each side for a while to help reach the lowers. just to give them a wee boost. is that a good idea just now? be about 530-540 tw in total.
Yo evilscotsman ! your flow rate is far to much mate ! if you set the flow to say half or a third of what your using you will see your plants health get better ! and ppm levels around 300-400ppm i use for a full weeks feed in each res !
an easy way of finding how much feed your plants are eating is could put say 400ppm of feed in and dont feed nothing else in res all week , and then when you come to change res could measure the ppm again and see what ppm of food your plants roughly eaten that week ! i found i was throwing alot of nutes away each week that the plant never eaten and thats how i come to use 300-400ppm levels all the way through grows from seedling to flower ! hope it helps !