My fry dicus die !!

[shaad]

Hay
I have problem in my experiment in discus breeding
First of all
I have 325 liter tank with 8 discus fish and 6 small angel and 2 botia and 2 bloko stomas and 2 pearl gurami
Planted tank (Amazon and....)
Temp 30 C
PH 7.5
GH 9
KH 5
Changing the water two time in the week
Every week I add sera morina and aquatan or (or sera black water) from sera co.
I have also a RO filter
In my first attempts (sorry for my bad language) of breeding discus it was very good experiment and successful
The Pair laid the egg (in a Main tank)
I take the egg form main tank to a small tank 9 liter and I put a methlyn blue
After 3 days the egg hatch and the fry wriggle for 2 days and then they fall
On 4th day the fry start to swim free

one time I have only tow fry discus still alive in 14 days of life and I make a big mistake after I install the RO filter I change there water to RO water
So I don't know that the ph of RO is 6 and my tab water is 7.5
So they have shock and they die!!
The problem now the last 5 attempts happened as follows:
The pair lay the egg
After 3 days the egg hatch
The fry wriggle on tube
After 24 hours all the fry fall down directly and die!
(from my previous experience the fry must stay on the tube 2 days wriggle at least )
I change the water in the incubator many times
I try many ways changing incubator water
i used :
Main Water tank I get same result on second day fry fall and dead
And tab water I get same result second day fry fall and dead
And RO water I get same result second day fry fall and dead
And RO water with salt mineral as follows: Ph 7.5 - Gh 2 - Gh 3 also second day fry fall and dead

The entire fry discus dies in next day after hatching (about 24 hours)

What is the problem??
what i have to do ??
May any body help me please?
Thank u advance

[rdiscus]

Lot lot of work to raise fry without parents ... Get another tank, and move a pair to breeding tank

[judy]

and the Ph should be below 7.0 and above 6.5.
7.5 is too high for fry to survive.

[Altum Nut]

and the Ph should be below 7.0 and above 6.5.
7.5 is too high for fry to survive.

Actually Judy I would have to disagree. I've raised Discus fry in harder water near 8ppm without any issues.
The fact that fry fall off breeding tube could be a number of bacterial issues. i think either the parents need cleaning (pp bath) or you need to clean breeding cone as it builds slime on the surface. The tank may contain pathogens which are attaching the fry. I'm no expert but suspect you can follow through some of those suggestions if you havn't already.
If you are breeding in R/O this will offer a somewhat better hatch rate. Once eggs are laid, you can gradually start to switch over the day after....I mean very small transition. The R/O water offers no mineral content that fry need to develop and grow unless you add it.

...Ralph

[judy]

Really? I thought for sure fry needed softer water... live and learn!

[nc0gnet0]

Bacteria in your water is killing your fry. Tear down and disinfect the breeding tank, keep up with at least 50% water changes every day even after the fry have hatched. If that doesn't work, what anti-biotics are available in your area?

Rick

[shaad]

hay
thank u every body for ur answer
i use 8 liter tank for eggs to hatch and i put a methylene blue on it
thats all
i try alot of water as i mention
tab water
ro water
ro water with tab
ro water with salt mineral
aquarium water
i get always same result fry die after 24 hours
the pair lay the egg in big aquarium with allot of fish as i mentioned
i have also sera sera fil bioactive ( external )

[shaad]

maybe the main tank have a gill and skin flukes ??

[judy]

you should have the parents in a spawning tank and let them raise the fry.

[Scott293]

Shaad, I would put the parents in a breeding tank and let them raise the fry. The fry need their parents slime coat to nurse on for the first few days. Then you can start feeding newly hatched baby brine shrimp which are to large for them to eat the first couple or 3 days.