What kind of filter do you use? If you have a sump or canister all you need would be something 3" diameter PVC with one opening choking down to your return tube length and hole in the side near the other end to leave to return to the tank.
With the side still open you'd put a clear tube bigger than your CF light and seal the edges to make it water tight. Then just hide all the wiring in a threaded cap for the top. It might not look pretty but that's how I would do it if I didn't get mine for 20 bucks at a pet store going out of business sale.
I looked into making a diy uv filter. IMO it's not worth the hassle. I love diy and have spent more on some projects than just buying a premade product.
With the uv light safety was the biggest hold up. It can't leak light or it can be bad on you and/or your fish. Plastic and glass choices are limited because of uvc's properties. Parts are not difficult to find but are pricey. If you do go diy I would love to see what you come up with, I love seeing peoples solutions to problems.
My idea was a clear tube surrounded by uv lights. A aquarts tube alone is pretty pricey.
I ended up going to petsmart and buying a greenkilling machine for 50ish. Ran it for 2 weeks, water was clear after 5 days. Now it's in the Cubard. If you want a inline light I've seen them with pond supplies for around 80-100. Simply splitting the return flow and using a ball valve would be sufficent to plumb it.
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