What's the problem?

[Star_Rider]

Once they start to spawn do you cut your filtration and water circulation? They may not be fertilized if the current is too strong. You should turn the filters/airpumps off when you notice them spawning. You may have more circulation in the newer tank compared to the 29g. Also, try adding hydrogen peroxide at a rate of 1 capful per 5 gallons to elimintate any bacteria/fungus from growing on the eggs.

I have 12x turn over in my 75(probably a little more) in many of my angel tanks the turn over is the same and I get high yields of hatchlings.

with discus you should not need to worry much about fungus and adding anti fungals to a tank with the fish present is generally not a good idea.
the discus will fan the eggs and help prevent fungus.
I still suspect the issue is new surroundings since this pair has had other hatches.

is the new tank in an area with traffic?

 

[yourchoice]

If the TDS is to high the eggs might never get fertilzed.Need a meter or the LFS will test it for you.

 

[Sportsnutim]

As a matter of fact yes I have a Cascade 1000 filter which puts out more water circulation. I have a sponge filter in this tank; the same one I used in the 29 gallon tank. I guess I need to turn it down quite a bit. Thanks for the info.

 

[Sportsnutim]

No, the area is low traffic, I have also shielded the back side plus the end of the tank where the cone is with white paper.

 

[Sportsnutim]

Ok, ignorance again on my part the TDS and LFS test?

 

[pinkertd]

TDS = total dissolved solids
LFS = local fish store

Just a sponge filter would be more ideal for the breeding tank.

 

[Star_Rider]

you can get by using a gh/kh test too
many LFS don't test tds.


some of the discus breeders here use mix ro/di with tap to reduce the tds..but they also do daily changes of up to 50%

I agree with Debbi.
just use a large sponge filter or deflect the flow on the cascade.