I've recently finished renovating my long abandoned 500 gallon koi pond and decided I would like to try brackish. However the only problem I have is that I live in Canada and it gets pretty cold ( although wouldn't the salt make the water warmer?) and I'm not extremely familiar with temperate species although for sure I would like to get some european sea bass and some mosquitofish. So in summary would this be able to work or would it fail miserably?