no, dosnt really make any diffence to you, however on the plus side, keeping a large body of water in a greenhouse is a great thing for the greenhouse, is absorbs all the heat and helps to keep the grennhouse temp up at night (a giant radiator) also, it will keep the humidity up beautifully, my advice to you, don't worry about the ro etc it will be fine tds all normal etc, but get some tomatoes and peppers in that greenhouse with your ibc :-)