In the spawning and fry tanks I use a natural planted tank with soil/dirt substrate and sand cap.
Plants-java moss, java fern, hygrophila, Mexican oak leaf, water wisteria, ludwigia, myriophyllum, rotala, cobomba, tiger lily, crypt, vals, sags, swords and floating plants water lettuce and duckweed
Due to the design of my NPT set-ups I don't make water changes on the spawning tank (full to the top with water) on a regular basis, but I will usually make a 50-75% the day I introduce the pair (regular weekly water changes are recommended on standard set-ups), however, I do make 50% daily water changes once I start feeding the fry (live foods) and after they are transferred to grow-out tanks to get best growth and development.
I started this method several years ago and have had great success as compared to the bare bottom/half tank water method/semi-planted/gravel, both methods are good IMO/E-I just like the natural method better...its what works for me.......
Lots of different ways to spawn and rear fry-after lots of research you will find many methods that work well for people, it is finding what works best for you, your breeders, set-ups, source water...etc......