Can I switch from sand to gravel?

One thing to note, my fish breed in this tank and they’re fry that I couldn’t take out. How could I avoid killing them or getting them killed?
Is there a way you could remove them with a paper cup, it is safer for the fry than netting
 
let the fry grow up for a bit before changing the substrate, or move the fry out, but don't lift fry out with a net because you can stuff them up.
 
let the fry grow up for a bit before changing the substrate, or move the fry out, but don't lift fry out with a net because you can stuff them up.
Ok. I don’t think I’ll be doing this until the pandemic is over anyway. I have to wait until they are big enough or aren’t breeding
 

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