Which worm should be rainbow?

I am a collector of glow worms among a few other pets, and I’m trying to rainbow tier one. Maybe two if it wouldn’t make me go broke, but it will haha. Here’s the deal: I always wanted to rainbow tier the first one. She was my first ever glow worm token pull, and the luckiest one too, because she matched my outfit perfectly when I got her. In my head she was destined for rainbow greatness. But I love all my wormies, and I don’t want to combine/lose my gummy worm and my golden baby! Should I leave those as ruby tiers and focus on just rainbowing the first one or should I switch? I already done messed up tiering the gummy worm so I’ve lost some progress. I don’t think I’ll ever have enough worms for 3 RAINBOWS sooooo