I have a great setup for euros and wrigglers. I have 3 old bathtubs I buried ground level with my backhoe and raise rabbits. The rabbit poo drops into the tubs and the worms take care of it. If anything I have too many worms with this system...not my idea but sure works good but you have to have rabbits. The sunken tubs keeps the temp stable winter and summer.

21 Acres 3 great ponds all spring fed. A 3 acre a 2 acre and a 1/2 acre