Cor 20 or 15 for 75 gal with UV sterilizer.

[aaron186]

I need help on if a Cor 20 is too powerful for my tank

I just plumbed my Reefer 350 (75 gal) to a trigger platinum sump that is running a pentair 25 watt UV sterilizer that runs off the main return. My return comes up and then does a 90 through to back of tank, and then several more 90s until returning to sump and then up to display. I’m running a Neptune flow meter. See pics below.

I currently have a Cor 20 but I’m wondering if I should return it for the 15. I’m worried it will be too powerful. It’s also quite large in the sump. Is the 15 smaller though?

thanks for your help

 

[Cartoonfanboy]

I have an E260 Max and I run a COR 15 at 30% with a UV.

 

[aaron186]

Do you think a 20 will too powerful though? I’m fine running it low if it won’t overpower the tank

 

[flashsmith]

You can turn it down enough and you'll be fine with that pump. I run a 20 on my 150 at about 80%. If you run at 50% that's 1000gph. Which is about where you want to be. Then go down from there if needed. I run a separate pump for my uv to get the flow down around 150-200 gph.

 

[Mark Gray]

I run 2 Cor20s on a 90