So im moving my 4 goldfish and two koi into a 75 gallon tank in my shed for the winter (I found that tank on the side of the road and it looks custom built)It has two pipes in the upper back side of the tank. One is a 2 in pipe that has a 1in adapter and the other is just a 1 in adapter so besides the infeed and outfeed pipes there is no filter so I'm wondering if i should make one. What I want to do is like a canister filter so the waters less likely to freeze. I don't know really where to start so i need help from an experienced diyer who can come up with a good idea along with a stock list of what i would need need. There's a picture too if i did a bad job of explaining my setup. Any idea would be a great help
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