Silent Killer- Who done it?

ChrisM101

New member
Ok, so Im fairly new to the hobby, but ive always tried to research my stockings and go slow. But This is a question that really has me mad.

My yellow watchman Goby is dead... He is currently in the hands of my Coral banded Shrimp. But He has been very healthy up until this point... and now of course he doesnt look like he just died, but he was fine yesterday.

However, in researching, Im thinking maybe the CBS didnt kill it, but perhaps a Brittle Star. ive literally had a brittle star in the tank and it had hid under a chunk of coral since i first populated the tank with inverts and before fish.
He never moved, even though my serpent is always out and about.
Well two days ago, the brittle seemed to move from his coral chunk up into the middle of the tank in the area the goby seemed to call home.

So would a mid size CBS kill a good size 3" goby, or was it more likely the Brittle, which i have never seen out and about , but suddenly moved into the Goby's domain? The CBS is the newest addition, but has been there about a month, and doesnt even mess with the peppermint shrimps.

Judging by people calling them mostly reef safe /fish safe, it seems that just like anything else it varys from fish to fish and tank to tank. But then i see alot of posts now that say CBS will spear some fish , but by the same token I see that people say, Brittles are Goby slayers...

It sucks that I paid 3 times what the CBS and brittle costs combined for the watchman and he had been in there happy for 6 months or more.

Any thoughts?

It seems like Every time I seemingly find a new addition someone has had one that was fine and then someone has one that went crazy on their tank. Is it really that random with every saltwater inhabitant.

Ive got freshwater fish intermixed for years with things like shovelnose cats, redtails, half dollars, loaches etc. and they dont go around eating one another or even the small ones.
 
Folks throw around terms like 'very healthy' and 'happy' with impunity .... when we have little idea that either are actually true. There is also a tendency to look for the 'boogeyman' in any fish death. While it's certainly possible that a large coral shrimp or brittle could ambush and kill a fish, it's far more likely that your goby died for other reasons and is being scavenged. Watchman gobies are notorious for not eating well and slowly starving.
 
He wasn't starving and ate well. He would eat flake,pellet , and pods. Most recently I added 2000 pods on my last coral order which was mid January, you can't move the magfloat without pods scattering.
 
Some of the larger brittle stars can catch and eat fish.
Coral banded shrimp are rather less likely to kill fish.
But disease or accident should also not be excluded.

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Was there any spike in nitrate levels for the tank? I would do a test of the water quality before looking for other causes.
 
Don't see how testing for water quality is going to help point to a particular cause of death? Please explain.
 
Brittles are voracious scavengers. Whether the fish was killed by the star, or died from another reason, the collective CUC will still consume the body. Impact on water quality will be the same (and likely un-measurable) and testing will provide no insight.
 
Is it a green brittle star? (a known fish eater)

Brittle Starfish (Ophiocoma paucigranulata)

COMMON NAME: Brittle Starfish
SCIENTIFIC NAME: Ophiocoma paucigranulata
SIZE AVAILABLE: ~3 inches
MINIMUM TANK SIZE: 20 gallons
FOOD/DIET: Omnivore
CARE LEVEL: Moderately Easy
REEF SAFE: Yes

It looks Brown to black in color
 
I had a CB shrimp that would legit grab fish and not let go, they can be nasty. I also watched this shrimp pull a jawfish out of its hole, and try to kill stomatella snails. So sure like others said its possible, but again its also likely that it died from a dozen other causes. Sadly in most cases we never really get to know for sure what the cause of death was. However if your CBS is aggresive it most likely isnt going to change, I sadly ended up rehoming my most recent one because of his actions.
 
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