Please Help Me. I'm At A Loss

[dann172]

Hoping someone can help, I'm having major problems with me tank. I have a 200 litre planted tank that was well understocked
with 15 tetras, 3 clowns, 2 glass cat fish, 5 amarno shrimp. My tank has been like this for around 9 months and I'd never had a problem.
the water quality is and has always been excellent. Ph 6.5.
Two weeks ago I decided to add to the tank. I added 3 rockshrimp and 6 cherry barbs. Two days later it all started to go wrong. Every
day for the last two weeks I have lost fish. The fish I've lost are 1 clown, 11 tetras, 2 cherry barbs, 2 glass cat fish. The shrimps don't
as yet seem to have suffered.

The problem is the fish act and look fine are eating fine and then 2 hours later I go to the tank and I've lost another fish, they never
show any signs of illness or injury.

The local fish shop have told me they haven't had any problems with the fish I've bought and advised me to try an internal bacteria
solution. This has now been added and re-added for over a week but I'm still losing fish.

I'm at a loss as to what to do next...

 

[scooterchick]

Hmm, have you added anything other than fish? What other stats do you have? You say your water is excellent, what are your readings for amonia, nitrite and nitrate?

It's possible your PH has changed suddenly which fish hate, it's also possible your tank has went through a mini cycle due the increased load of fish, that's why it's advisable to add new fish slowly. It's also possible they're suffering from an internal bacterial thing. How often do you change your water?

Incidentally your tank was far from understocked, it was more overstocked I'm afraid. What kind of tetras do you have? Is it clown loaches you have? If so, they're far too big for that size of tank, should really think about rehoming them.

 

[afishdude]

i agree, if those are clown loaches you are very OVERstocked