You'll never get anywhere near that kind of flow. Im currently running the 13000 for my uv. Max flow is advertised as 3566 gph. I have it running at almost 100% through 3/4" pipe. It also goes through 3 90s. Most ive ever seen out of it was 425gph.
This is at 88%
Do you want it reef safe? I have "transparent" red petg but it doesnt really print clear. If it doesnt need to be reef safe I have a resin printer that can print clear red.