Jett link skill

Can supernova dust de-rank? I got the yellow rank (/35) with the supernova dust and before I go crazy with them to try and get 35 attack do they de-rank? Should I be using the Condensed Supernova Dust instead?

Supernova dust can de-rank at a very low rate. Never tried the condensed ones

I don't remember what they're called, but the cube that changes rank has deranked my core once.