hey got a 5x5 double walled room (plastic walls/interior panda plastic). I have a 1000w MH 6in cool tube, reduced to 4in that runs to a 190cfm exhaust fan w filter. I have two 4in vents and one 4x6in vent in the walls low to pull in air past my buckets. I have four 5gal buckets running a lil less then 4gal. my temp is about mid to high eighties and I am having constant root and nutrient problems. some of this is contributed to PPM control which im getting figured out. but I have a feeling water/room temp is a big part as well. any helpful advice is appreciated but specifically what can I do to regulate water temp? don't have the money for a chiller, don't want to use ice, and not sure if using a submersible pump in ea. bucket to crate like a waterfall in the buckets would regulate temp enough or just heat up the water more? Help please.