All my salt fish died...

tealio

New Member
I started into the saltwater hobby a little under 2 years ago after maintaining fresh and brackish fish for over 10 years.

I consolidated my 2 saltwater reef tanks into one 55 gallon yesterday morning and this morning when I woke up all of my fish were dead.

I've had all of these fish for between 3mon - 2 years and none of them showed signs of being sick. I setup the 55 using water from my previous 2 salt tanks, and added about 18 gallons of new pre mixed water. I setup the 55 using only cycled sand out of my old salt tanks, I used the same canister filter, same live rock, and most of the same tubing for the filters, I replaced 2 pieces of my tubing because I needed longer ones. I tested the PH, calcium, ammonia, nitrite, nitrate, SG, and temp and the results were:

PH: 8.1
Calcium: 400 ppm
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 40 ppm
SG: 22.5
Temp: 77.8

My nitrates were actually higher in my old setups because I neglected to do water changes for 2 months prior to my upgrade. My fish have been through worse with me than changing tanks and they are all pretty hardy fish in general. ( 2 ocellaris clowns, 1 red anthias, 1 lawnmover, 1 yellow-tail damsel, 1 purple dottyback, 1 pajama cardinal) For now, my corals are all still alive as are my crabs, snails and worms.

I moved tanks before and have never had anything like this happen to me. I'm hoping someone more experienced than me can help me figure out why it happened and if my water is safe to start over, thanks!
 

snakeblitz33

Well-Known Member
When you re-used your sand, did you rinse it first? It doesn't sound like you did. Did you notice any kind of foul smell coming off of the sand? Dissolved hydrogen sulfide is a common killer when tanks are transferred over. A test kit won't tell you everything.

I'd be good if you can let everything settle and do a 50% water change as soon as you can and let the tank re-cycle for another 30 days by feeding the tank the same amount of food as you would feed one fish... then test your water again at the end of the 30 days to make sure there is no ammonia or nitrite.



By the way, sorry for your losses. Better luck in the future!
 

tealio

New Member
No I didn't rinse the sand :( . It didn't smell any worse than I think saltwater tanks generally smell, but it makes sense because the sand is fairly old, it was given to me a couple years ago by someone who had it in their tank for 5 years. I'll do what you suggested and do the water change and re cycle the tank.
 

snakeblitz33

Well-Known Member
After a water change, run a good bit of carbon in the tank to lock up any noxious molecules. Saltwater tanks should smell a bit like the ocean - not smell bad.
 
Top