Are your tanks bare bottom or do they have some kind of substrate

I had tanks with substrate and without substrate. I will try to fed them with some garlic because i saw that is good against parasites or what you sugest? now i'm feeding my pair with cucumber and some flakes but flakes in a smal smal amount. But normaly i'm using vegetables now. Thank you!

Hi,were the fry that died in a bare bottom tank or a tank with sustrate?

They need more than cucumber and a tiny bit of flake food.Can you get algae wafers there?

Do you hoover the gravel and do regular water changes and do you clean the glass on the bare bottom tanks?

to be honest it sounds like they are suffering from ammonia poisioning which would be what i would suspect given the low tank volume and high fish density

I would be looking to stop them breeding for the time being til you can sequre a larger tank. take the cave out.

also, 15ltrs is really too small for bristlenose regardless of breeding, they would be much happier in a 50-60ltr tank

To ID the bacteria the poop would have to be checked in a specialists' lab.
I do know what is the situation there, but in Hungary a small fortune would not be ebnough to pay for that.

Ok... For mister Bristlenoses the answer is YES YES YES. Doug I purchased your book and is amazing. Thank you for the efort! This tank is for the moment because I'm gona move them in a 90 litres aquarium. Thank you for the answers guys and Mary .

I am a mrs and was just trying to help.I hope you have more luck with future batches

As I said, thank you all for your help including you mrs ''Bristlenoses''!!!! I will move them in 50 L tank or 40 as soon as posible. Is a realy pleasure to talk with you folks!!

Good luck i hope all goes well

no worries with the book mate, always glad to hear that its helping someone out!

Sounds like you have your head screwed on pretty tightly, should not be long before you have ironed out the kinks!