They are located west of Nashville,TN. In Dickson Tn. I live only a hr away so i just drove over and looked at there tanks. I do agree about only using there acrlic tanks as sumps only but from what i saw they were well built.
I think its "low iron" glass not low-e. Low-E glass is used for house windows to keep sunlight from heating up your house in the summer. Low Iron is more clear i.e., not as green.