Good luck man! They are looking well and healthy :). And you left some space in the pot to fill in case they stretch? My royal dwarf got quite big as well... Haha.
My indoor plants had some issues with those flies as well. I bought these glue sticks/papers/traps that you stick in the pott. It doesn't kill the larvae, but it attracts the flies when they get out of the soil. It works really well for me and most of them are trapped hehe.
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