Fish dying one by one - Cycled tank

[suicidal_maniac]

Thanks for the replies
Ammonia and Nitrites are about 0 the colour looks a little different than the photo

 

[suicidal_maniac]

Although maybe its my eyes that are off! Any thoughts on the missing otto belly?
Ive been away with work so it didnt get a water change for nearly two weeks, its normally 25% a week, with some optimum added t the water and prime dechlorinator

 

[Colin_T]

Any thoughts on the missing otto belly?

The other tank inhabitants (fish, snails, shrimp) might have eaten the belly after the Otocinclus died.

 

[itiwhetu]

You seem to have lost your acid loving fish. Neons and ottos. That will because you have an Alkaline tank

 

[fishyfun&fans]

The Marimo balls look dead. Is the tank even cycled properley

 

[fishyfun&fans]

And there looks like half of that fish is missing on the photos?

 

[FishHobby99]

The other tank inhabitants (fish, snails, shrimp) might have eaten the belly after the Otocinclus died.

Good call, very likely. fish are little cannibals.

 

[suicidal_maniac]

Checked the PH again and I’d say it’s about 7.4

 

[fishyfun&fans]

do you research anything before you buy?

 

[Ch4rlie]

That is a bit unusual.

The plants don't look great, could be water issue?
But before we go any further, a couple of questions.

How long has this tank been running and what is your usual routine for weekly water changes etc and do you normally gravel vac etc?

 

[suicidal_maniac]

Yes of course, I’ve had happy fish tanks for 20 or 30 years, just checked again and there are no nitrates in the tank, this is strange

 

[Ch4rlie]

So this tank has been running for 20 - 30 years?

No nitrate, do you normally get a nitrate reading?
If so, then could be down to the changing of filter media and a mini cycle is happening but that is not conclusive at the moment.

What about your usual weekly water changes and routine?
Do you normally gravel vac the substrate at all?

 

[suicidal_maniac]

Totally appreciate the help here
gravel vac once a week, 24% water a week, tank had been fine for 6 months, then I added a couple of new fish…and boom, the grim reaper now lives in the tank

 

[suicidal_maniac]

Totally appreciate the help here
gravel vac once a week, 24% water a week, tank had been fine for 6 months, then I added a couple of new fish…and boom, the grim reaper now lives in the tank

The gavel is quiet deep at the back and I did give it a good turn over cleaning it one time recently

 

[fishyfun&fans]

you need a small tank set up as a 2 week quarantine tank to put new fish in and observe them before adding to the main tank

this will and is the only way stop disease spreading to your main tank

just a future note for you