Which Is The Murderer?

[fishmad135]

well i have a few neon tetra, 1 cardinal tetra, 3 rummy nose, 2 black neon tetra and 3 bumble bee goby. Over the last three day 2 neon tetra have died, one looked like it had swim bladder but the fins on the other one were shredded and tawn. now today when i got up my cardinal tetra has a small 2mm bite on its side. Out of these fish which do you think are the cullprets? thankyou

 

[fishmad135]

Plzz help!! i wanna get the murderers out of the tank i dont know which one... which is most likely??

 

[tropic_john]

how old is the tank? most neons die very asily in tanks under 4 months minimum.

 

[fishmad135]

well i started this tank in november but last week i swapped my substrate for sand. i put the same filter in the tank and i put 50% of the old water back into the tank. then when the heat was right i moved my fish back in.

 

[tropic_john]

I would have an educated guess and if the neons were small and the gobys are quite larger than thm, I'd place a bt on it being the gobies. Also, bumble bee gobies need brackish water to live healthily.

 

[fishmad135]

the gobies are around the same size as the neons.

 

[tropic_john]

I'd say its the rummynoses or the gobies

 

[Truck]

i would say you need to test your water, the fish above wouldnt kill each other.

 

[Turtle-Queen]

i would say you need to test your water, the fish above wouldnt kill each other.

so how does that explain the bite mark in one of the fish?

 

[Truck]

a parasite

 

[Turtle-Queen]

yeah hadnt thought of that, that could explain it. maybe a water test would be best done.

 

[indigoj]

bite mark likely occured after death - all fish will canibalise dead fish. None of your stock is likely to kill each other.

please take note of the point made about the gobys needing a brackish set up.

 

[fishmad135]

the one with the bite is still alive 2 are dead and my cardinal has the gash/bite.

PH = 7.5

nitrate = 0

nitrite = 0

GH = 60

KH = 40

i have had a look round my tank no signs of ich etc all the other fish look okay

 

[Curiosity101]

What are you using to test with. A Nitrate reading of 0 from what should be a fully cycled tank is very suspicious.

 

[fishmad135]

im using API 5 in 1 aquarium test strips, measures PJ nitrate, nitrite, carbonate and general hardness.

How much nitrate should there be???