Missing fish again, I think I know the problem.

[lifeofbrian]

I have just purchased 3 Pearl Gourami two days ago. Since then, I have a dead Harlequin Rasbora, a dead Rummy Nose Tetra, and two of the three new Gourami have vanished. I took my tank apart today, nothing. The last time I went through disappearing fish was when I had two Dwarf Flame Gourami. These are the only two times in 10 years I've ever had fish disappear. This must be more than a coincidence. The remaining Gourami was definitely the most aggressive out of the three, I recognise him/her easily as it has a bump on its head. I just read another post with a similar situation where the owner thought his gourami was killing at night when it's darker. Any thoughts?

 

[Colin_T]

Can you post a picture of the sick/ dead fish and the gouramis?

How big is the tank and how long has it been set up for?

Have you checked the water quality for ammonia, nitrite, nitrate & pH, and if yes, what were the results?

How often do you do water changes and gravel clean the substrate, and how much water do you change?

 

[NickAu]

Gourami don't just vanish. Have you got a lid on the tank? what sort of filter do you have?

just read another post with a similar situation where the owner thought his gourami was killing at night when it's darker.

Even if the Gourami killed the other 2 where are the bodies?

 

[lifeofbrian]

Two more dead Tetras this morning. They were alive and seemed normal when I went to bed last night.

I have a cf500 filter in a 30 gal tank which has a tight fitting lid.
Water changes 25% every Sunday.
Ammonia and Nitrite 0, Nitrate 25, ph 7.

 

[Colin_T]

can you post a picture of the sick, dead and healthy fish?

 

[lifeofbrian]

can you post a picture of the sick, dead and healthy fish?

 

[Colin_T]

the fish in the picture looks like a rummynose tetra with a bacterial infection. I can't tell anything from the video but if the other fish that died have red patches on their belly you might want to treat them with a broad spectrum medication.