At first when I added the uvs I had it set for slow flow, and I did notice that there were less pods. But, then adjusted the flow to fast and I have lots of pods now. As with anything, it is trial and error.
The other thing about using copper that NO ONE tells you is that it gets into EVERYTHING even the glass. Then you can not ever use that tank for inverts in the future. When I got ick, I asked at the LFS near me, and of course they said put it right in your 90 gal. tank. LOL "THANK GOD" I didn't listen to them. Then I asked other LFS what they thought I should do? In the meanwhile I put the hippo in a 10 gal QT and had added copper to it. Well, it didn't seem to help at all and then I had a waste of money with a 10g tank, nice filter, crushed coral, few pieces of LR, all contaminated with copper. I wish I had found the last LFS that directed me to garlic guard in the first place and there would have been much less money loss and also less stress on the hippo as you don't have to net the fish and transfer to QT. KR