I've been debating the purple/pink helix...geuss I'll pull the trigger and try it.For anyone thinking of using https://www.algaebarn.com/shop/aquarium-supplies/coralline-algae-bottle/ I am very happy with the results as of today. its only been about 3 weeks and I have spots of coralline all over my rock today. I started out with everything dry (even rinsed the live sand in RO so may as well have been dry). I have not added the CUC yet so its all from the bottle. I did order CUC and chaeto from reefcleaners today. I ordered the 20 gallon pack since the 65 seemed like too much for such a fresh aquarium.