Starfish killed the whole tank?

VictoriaWood

New member
Long story. We took over a 125gallon from a friend about a year ago. It came with 100lb of live rock, 2" sand, 2 powerheads, a nice big LED bar, a pump, a heater and a Red Sea Prizm filter. So we didnt have to add much. He also had 2 clownfish that were 6 years old, a sand sifting goby, 2 tangs, a hermit crab and a fish about 5" long that I was never able to identify. This is our 2nd saltwater tank and we keep a close eye on the water quality.
They all settled in nicely and despite being wary we added a little tiny BTA a couple months ago. Not knowing anything about them, we expected it to be a short-lived learning experience. He IS incredibly sensitive and rolls up into a ball if you even look at the tank funny but he seems to be OK, getting a little greener, and enjoys eating bits of shrimp every few days.
So impressed were we with our ability to keep an anemone alive, Thursday we introduced a 3" chocolate chip starfish. Within 24 hours both 6 year old clowns swam wildly, erratically for an hour and died. Terrified, we found the tank at a pH of nearly NINE (could 2 dead fish cause such a huge jump from 8?) and nitrates too high to measure accurately with our little test kit. Terrified we did a ~20% water change with a waste removal treatment. Late Friday both tangs were dead and I have not seen my goby since. Did another 10% change. Cleaned the filter system, pumped a ton of air into the tank. pH and nitrates are somewhat lower. Today our big fish is barely moving, I'm afraid he'll go today.
The part that doesn't make sense? The sensitive anenome looks fluffy and happy as usual despite the horrific tank conditions. The starfish is roaming around normally.
The starfish were alone in their tanks at the store WITHOUT fish. Could it have been carrying a disease that hurts fish but has no impact on inverts? How can I ever clean this tank properly to reintroduce fish, not knowing what killed them all? Any ideas appreciated. :uhoh2:
 
Wow, I haven't heard of that happening. Very sorry to hear. Did you add the water from the LFS that the starfish came in?
 
Nem might have been treated with Cipro, a broad spectrum antibiotic that could affect the gram negative 'good' bacteria in your sandbed and rock. The question is, was it? and how much could have gotten in with the water? Since the nem now looks healthy, it makes it doubtful, but that is one thing I can think of. I checked the internet for toxins associated with the chocolate chip, but turned up nothing.
 
Check the pH of the water you are using for water changes and also de pH of the tank. It is weird that the pH went high from a day to another.


Best of luck!
 
Well we were able to get our pH under control this weekend but not the nitrates and my remaining big fish started to appear white on the surface. We took him out to quarantine him and potentially treat him for Ich. He didnt survive the night. I am fishless! We moved all 100lb of rock and sifted our sand, never found the missing goby. All the disruption in the tank has finally upset my anemone too, he let go of his rock and had to be helped off his side in the sand today. His mouth is gaping and I expect he's finally succumbed to the nitrates and the moving rock stirring up the tank. He's reattached to the rock so fingers crossed he recovers. Soon the murderous starfish will be the only one left. I'm tempted to return him to the LFS before trying to restock, but at this point I still really have no idea what killed all my fish.
Any advice how to encourage the anemone? He's really taken a beating this week and I'm surprised he's still moving.
 
Some food will be good, a shrimp in small pieces moderate light and current with high quality water I think it would be the best for the anemone.
 
Sorry to hear about your disaster. It is so frustrating when the cause is not clear.
As regards cleaning the tank for future inhabitants, let it go for a while and let things stabilize. I believe most of the parasites, if that what it was, will expire without a host after a while.
As a side note, chocolate chip stars are not reef safe and have been known to eat anemones. I've personally seen one eat a condylactis anemone at the store I worked at. And there is this: http://www.reefcentral.com/forums/showthread.php?t=1728456

Hope you can get things back in shape again.
 
Yikes, thank you for that link. Our LFS was adamant that he was fine with all our critters. He might be best off returned after all. We've stripped our Fluval and our Red Sea Prizm and we're going to buy a big CUC and just leave the tank to clean for a few weeks until all these Nitrates go away.
My BTA is somehow still alive but he walked all over the tank for a day, has found a place with no direct light and he is rarely closing his mouth. I tried feeding him some fresh shrimp but he struggled to fully pull it into his mouth and let go of it an hour later. This is the first time I've seen bristleworms in the live rock, they immediately ran away with the shrimp. Must be hungry with nothing left in the tank to come out during the day.
I appreciate everyone's advice.
 
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