The 300w hydor inline heaters only come in 5/8inch barbs. The 2217's output is 1/2 inch tubing. Is there a step down or something i can use? Or will 2x200w inlines be enough for a 90g(will have 2x2217's on the 90g). The reason i am stressing is that in the winter the house temp hovers around 60 degrees.(like right now).