HELP !!! Dead fries for the 2nd time!

It's all OK, male guard eggs, I evacuate him after 5-6 they after fries become black and then, maybe 3-4 days later I starting to find dead fries! All fries live about 10 days and then died, maybe one or two survive! I don't know what to do, it happend to me two times in last month and never before! The couples are not the same ( I cannnot guaranted for female but male was different). It all indicates that fries are poison but nitrate are OK, and aquarium have same filter with another aquarium in witch all fries are fine! One aquariium is about 70 litres, filter about 10l and second aquarium is also 70l so it is 150 litres of very clean water so no way that fries were poison but they have some sympthoms (live babies are in upper level, they don't eat, and before they died they swim irregulare). I gave them swiss chard, all my fries eat that and they all are OK. Only thing that I can notice that all dead fries have maybe bigger stomach, Help me, If somebody else have same problems! Thanks!

Try leaving dad with the fry & do not take them away from him.

Babies need the nutrients from dads poop to grow up healthy.

Also what do you feed them & how often, mum may not have enough of the right foods to provide the eggs with correct nutrients.

that is to bad and Chaase has a point

pH?

Hardness?

Temp?

ph 7,4, gh 11, temp 26, I have 14 aquariums and used same water for all, it's all fine with water for the last few years. Nutricion are good too, cucumber, spiruline, peas etc. I have over 100 breedings in last few years, have expirience, always everything works fine except this two times in last month (I have 3 succesfull breedings too in last month)

Parameters sound ok, food also. Maybe try leaving them in with dad for the entire time & see if that helps...

yeah, all seems ok.

I would also look at swapping the male over with another if possible. have a chat to any other breeders in your area about a bloodline swap i.e. a male for a male. it could be a genetic issue, even with unrelated fish you can sometimes get un-compatable fish. I have had this in the past, sucks!

I try with two different males I write it above, I am not sure about female is she the same or the couples were totally different. Things that scare me the most is that no one else have similar expirience, I catch carefully rest of the fries (about 10) and put them in another tank, with water from another tank (but similar parameters) we'll see tommarow what happend put I really don't believe that they'll survive, I found today 20-30 dead fries and the rest are again in the upper half and don't look healthy at all.

Hi,can you say what other fish and how many are in the 70 Litre tank with these babies ? Also is there plenty of water movement and oxygenation and water surface movement? Is there gravel and if so do you vac it regularly? Do you have wood in the tank and how often do you do water changes?

Do you mean that you take the father away from the babies before they leave the cave?
Are you only feeding the babies swiss chard and nothing else?

Bristlenoses

In another tank who share the same filter there are also ancistrus, LF, 11 (about 5-6cm) and one albino ancistrus. They are all fine. In the tank in witch are/was babies there are no other fish, only them. It is plenty of oxygen and surface movement but nothing special and different in compere to other aquariums in witch all fries are good. No gravel, wood, only cave, I change water before breading and after that I only vac it. Yes, I move father when fries have 10-12 days (5-6 days after they became complete black, i don't know the right term but 5-6 days after they have no yellow color, or egg visiable)

feed tham with swiss chard, cucumber, pies, spiruline but fries who die don't have tendency to eat, I believe they don't eat at all. They are all first in upper part of the tank, then start to swim strange and then died. Before they died they fall on the bottom and trying to swim, like they are poison, or like angelfishes when fries can't swim when water is hard (stupid exemple but remind me of that)

A major dietary need for Bristlenose is some driftwood. See if your loccal petshop/aquarium has some & add it to the tanks

You need to keep doing water changes every few days about 50% in a small tank and also if you have no gravel give the bottom of the tank a good wipe over.You should not be removing the father you should leave him with the babies in the cave and in the tank with them.Why do you remove the father? Also you need to get some bog wood for the tanks.Do you use water dechlorinator?


Bristlenoses

I have some kind of rutine, like I say i had over 100 succesfull breedings, and this 2 unsuccesfull scare me. Only toughts is that this has to be something with genetics (but they are not related), maybe they are un-compatable I don't know. All water stay at least 2 days in barrel (120 l) and then goes in tanks.

What is swiss chard? I agree that is sounds like they are being poisoned. Any little newborms are extremely susceptible to toxins. Have you checked the tank over? Maybe something fell in there? Do you have kids? They get into all sorts of trouble.

If I were in your situation I do a 50% water change now and again in 2 or 3 days.

And about the dad poop theory. I cannot say for sure how beneficial it really is. I raised 50 ish fry from eggs without dad and none have died!

Good luck, keep us posted.