UPDATE:-
So the first chiller i borrowed didnt work and was huge! Way to big for my tent, curently on plan F i think haha, ice blocks... found that a 2ltr bottle of water frozen will keep my tank below 19/20 degrees for 4 and half hours. Alot of work but it seems to be my solution for now, just brough 6 bottles so i can alternate, (3 in the freezer and one in each tank)
My silver bullet arrived today so now got some of that in the res to help protect the roots, Emptied my tanks yesterday and cleaned them all out, and refilled my tanks with a fresh res at 1.4EC. The roots are looking very healthy, just keep monitoring the leaves. Raised the lights an extra couple of inches yday.
Photo shows cctv shot of my tent at the minute. Friday will be week 4 of 6 veg stage. Topped a bit more yeaterday, how much and how often do you guys reccomend topping? (Cheese)
Thanks All