I will ch
I will check with the lfs guy as he is hooking things up for meIf you are going to spend the money, get a single Pentair UV sterilizer, especially since you are more after parasite control than algae. I think the 40 watt unit is rated for a tank your, but the flow rate is much lower for parasites, so low I would run a separate pump from your returns.
Here's a link to BRS website you can check out what they recommend flow wise. https://www.bulkreefsupply.com/emperor-aquatics-smart-uv-40-watt.html