Created a problem 2 days ago in my FOWLR. Here is what I got.
Equip and Setup:
55 Gal FOWLR
AquaC Remora HOB protein Skimmer
Rena Fila Star XP2 Canister (Empty, For flow only)
couple of power heads (about 1000 gph total)
90 lbs live rock
140 lbs 1-2 mm Coral sand (4" DSB)
Stock: (Trying to keep it light)
2 False Perc Clowns
1 Sand sifting Gobie
1 Hawaiian Feather Duster worm
1 Skunk Cleaner Shrimp
1 Black Hawaiian Brittle Star
2 small Hawaiian Rock Boring Urchin
5 small-med Hawaiian left handed hermit crabs
15 or so small snails
Ok, so I thought I would make a simple water change fitting by connected a !!!!BRASS

!!! T-fitting to my canister filter outlet. BIG MISTAKE!!! So the next morning all of the invert were hurting from the copper released into the water column from the brass fitting. I pulled everything I could out and ran down to the local saltwater well and filled up everything I could fit in the back of the truck. I got home and did a 90% water change and put about 8 oz of activated carbon in the filter canister. Of course I removed the brass fitting. I also added a dose of Tetra Aquasafe in hopes that it might bind with some of the copper and allow the carbon to absorb it up. All fish were and are doing great. Never saw one sign of stress from them. The inverts were hurting. I pulled them out and put them in bowls and cups all over the kitchen. I left the feather duster in since it is buried deep into the sand. About half way through the day the shrimp rolled over and died

. The Brittle star basically self destructed

. The feather duster was all curled up and moving slow. The urchins were laying flat and moving way slower then normal. The hermit crabs were also in slow motion. So, I ran out and got a copper test kit from the LFS and the first test cam back 1 PPM copper. Never know what the highest level was since I changed all the water out and dosed the tank before I got a tester. Today I found another LFS that carried Cuprisorb and put a pre made 100ml bag into the Canister. I also did another actived carbon change (8 oz).
I also bought a second copper test kit to make sure all my reading are good. Both test kits now read 0 ppm :thumbup:. So far the feather duster is doing great. Reacts instantly to the slightest touch and change of light. Fully extends and looks good. Hermits are still moving slow and urchins are doing better but not great. There spines are standing up now but still moving way slower then normal. All my water tests look great after the massive water change and all of the chemical filtering (Ammonia- 0 ppm, Nitrites- 0 ppm, Nitrates- 0-2 ppm, Copper 0ppm, salinity 1.024, PH 8.2, water temp 80F). So, the question is should I take the hermits and urchins back to the reef/sand flats were I collected them? Or will they recover? Also, is there anything else that I should be testing for after the brass fitting disaster? Any advice would be appreciated.