hmm well thanks for the advice jackdawack as I said before I think when I change the res I'm gonna only add 1/4 teaspon which should only put like 70ppm of nutes in the water I'm hoping that should avoid any possible over fert...should I worry about the res temp getting down to 60? or was the rest of it all probably fine? if I should worry about temp what would be the lowest to allow cause I'm hoping to save costs of space heating