Good idea. I have an outside sump for my 90g and I love it. The sump is enclosed in an insulated box with a lid and a front door for access. This box is on the sundeck right outside from the tank. Sliding glass door to deck is three feet from the tank. Plumbing goes through the exterior wall. I have never had a problem with heat or cold since I set this tank up. (3 years this November) Powell River climate is no different than Vancouver. Go for it, I'm sure you'll be happy with it.
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225g reef
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