I dont use anything special. Just Sera plant substrate, gravel and just normal daylight light which i got standard with my juwel tank!
I dont use any co2 things.
Unfortunately 1 corydoras julii died last week, dont really know the cause but i know since i got him he had damaged mouth, so i think he was not able to eat
Anyway i did not spot any other weird behavouir or signs on him.
My male honey gourami is buidling bubblenest all the time
But they did not have any babies yet.