Had a little peep in my males cave tonight, to see 4 or 5 wriggling eggs

It's hard to see in there properly but i can see little eyes & tails!
Did a cold water-change on Sat & had been checking everyday to see if there where 2 fish in the cave, but never saw them together.
Water parameter's are; Temp 29C , PH 6.8 , Ammonia 0, nitrite 0, TDS 240 ppm, KH & GH 5,Nitrate 25-50 mg/l.
I know the nitrate is high & have been trying to lower this as my tap water has high levels & was going to use RO to try to lower the levels tonight, but now with fry i don't want to do too big a change.
Would 10% changes each day be ok with the fry or should i try to lower the nitrate faster, what levels are ok for fry?
It's hard not to peep, but they are a truely amazing sight.
I am leaving them with dad in the main tank for the time being just hope all goes well
