I've decided to hold off for a bit - might have to completely redo how I have things set up in my different tanks - my female platy is having her brood. Good thing that I isolated her into a breeding chamber last week.
I will try just adding some supplement nutrients to the tank for now. Once I figure out what I'm going to raise fry in then I think about a CO2 system. (The guppies in the terrarium are also getting very close to delivery too)