Dead fish? and i dont know why!

[ng80]

hi

i have a 100 ukgallon tank with 1 big external filter and 1 internal fluval 4+ and a uv steraliser.

the water parameters are:
ammonia 0
nitrite 0
nitrate 10
pH 7.8

temp 78'C

I have lost 1 texas cichlid 3" and 2 tinfoil barbs 5" in 1 day.
there is no sign of disease.

the remaining 2 tinfoil barbs seem to bash each other a lot as though they are fighting.

The other fish include 2 synodontis and a fire eel none of which are aggressive.
the convicts are only interested in each other and stay well out of the way.

I have watched the cons extensively and they are not aggressive so i think i can rule them out.
the catfish and the eel are quite peacefull and rarely squabble.

so is the tinfoil barb the culprit that murdered the other fish or am i just unluck that 3 fish died so clos together but co-incedence's in fish keeping are very rare.

any ideas folks will greatly be appreciated as i am probably getting rid of the tinfoils and geting some more texas cichlids to grow on.

 

[Scottfree]

Parameters seem perfect it's hard to say....We're the Texan's beat up? How long has the tank been established?

 

[Peanut_Power]

Sometimes you just get flukes like that. Was this after a water change that they died? Might be pH shock, or chlorine, or possibly even heavy metals.

 

[twk1]

Sorry to hear about your loss. How long have you had the three fishes?

 

[ng80]

i had the tinfoils and texas 4 months and the tank is a year old . I cant find any reports of aggressive tinfoil barbs. the tank was not cleaned before they died and i am stil confused as to why it happend the was some damage to the bodys of the tinfoils and a few scrapes on the texas, but they were not infected

 

[b_strap]

I guess just watch them close and see what happens.....sometimes that is all we can do until they can talk to us.