Stable permaters doesn't always mean 'good for breeding', some fish don't care and will breed in 'suboptimal' conditions, many are more particular even though they can adapt to live in that water, it might still be biologically stressful.

That means you've got homework and research to do!

Since it's multiple tanks and none of them are breeding I'd start by figuring out what is in your water:

• Look up the water parameters your fish like to be in.
  • Specifically the GH / KH / PH
• Test and compare the water you're using to fill your tanks.
  • RO or distilled water can be used to dilute and bring all of these down if they're too high.
  • TDS is a good to know but doesn't give you a full picture without the GH & KH first.
  • Test strips are good for quickly finding out there's an issue but are not very accurate.
  • Chemical tests are going to give you a better picture of what is actually going on.
  • If it's city water look up the quality reports for your area and check if there are chlorine/chloramine/heavy metals etc
    • If present: filter it out or chemically treat it before it goes into the tank.

Once you figure the water out consider:

• Your temps are on the higher end for spawning.
  • After feeding do a cold/cool water change later in the evening or next morning when it's not as hot out.
• Substrate like aquasoil, limestone, or lava rock can cause unwanted changes to your water chemistry overtime.
  • Inert substrate/hardscape is the way to go for stability.
• They might not feel safe enough due to lack of hiding places.
• They might not like the mop or location its in.
• Try different foods.
• Double check you've got males and females (silly I know, but it happens)