First, you need heat if you can not get the magic temp of 75 deg. If you do not live in a cold climate or own a refrigerator you might need a heating...
Root bound, probably yes. Look at the last pic you posted, see how little that light is getting to the lower parts of the plants? That is why I like...
Your res temp is pretty high. You will defiantly get root rot again if you do not get that under control. I would try to get your water temp down and...
Rat, raccoon, possum, woodchuck and may others will do this. Chicken wire layer on the ground slightly under the surface will stop most digging. Good...