im thinking of building a huge tank for the garage, i have been doing some talking and have some worries about it.. i live in utah in the winter is gets well below freezing and sometimes belo 0 degrees... im planning on putting atleast a foot thick of insulatoin around all the plywood but here is what i have been warned, if the tank is 86 degrees inside and on the outside is say 6 degrees will that have any effects on the glass? obviously the glass wont have any insulation on it.. some ppl have said the seal on the glass will pop or break, others have said as long as the water temp doesnt fluxuate threwout the day then it wont matter how cold it is on the outside. there fore insulation will be the key. im looking for any thoughts or opions and if you do have a guess please explain your reasoning giving me thoughts, thanks