Hi
I wouldn't add fish if your aiming to achieve a Limeade coloured drop checker

you may be asking for trouble!
You could gas or stress your fish!
If fish are coming from a similar Co2 aquarium environment there maybe less stress on the fish.
Stick to the green colour for the time being, add your plants and make sure your tank is mature and cycled properly

When ready to add fish.
De gas the aquarium back to a blue coloured drop checker, then add your fish monitor the fish for a few hours then switch on the Co2 this is a critical time for the fish so be vigilant.....if the fish start heading for the surface, you know they are Co2 stressed and you need to dial back the injection rate, and up the aeration!
hoggie