- Joined
- Jan 5, 2019
- Messages
- 1,572
- Reaction score
- 902
Yes I only use RODI. Using Hanna checker I got 0.19ppm in the DT. My RODI tests at 0.01. I read some of Randy’s posts about the Hanna giving false copper readings in the reef tank. The poly filter is only turning brown and I haven’t found anything rusting. I haven’t used the Cubrisorb yet.Honestly, when I have seen this level of tissue loss in response to copper all corals were affected. It was due to installing a new pump at a store, which we found out had a brass seal in it (don't buy pool pumps for coral). The poly pad turned blue from that.
I'm wondering what concentration would produce that change in the pad. What did your LFS test your copper at? I only saw your tap water concentrations, but maybe I missed it. Do you use tap water as your source water? No RO/DI?