Question about the fallow period

[becerril17]

Can velvet survive off of coral food or food fed to the anemones and shrimp?

 

[ichthyoid]

“For the studies on cryptocaryoniasis, Lokanathan et al. [18] generated and analyzed ESTs of C. irritans tomonts to identify genes that encode surface proteins, excretory/secretory proteins and repeat-containing proteins; and this is the only report so far.”

Transcriptome analysis of dormant tomonts of the marine fish ectoparasitic ciliate Cryptocaryon irritans under low temperature - Parasites & Vectors

Background Cryptocaryon irritans, a species of obligatory ciliate ectoparasite, can infect various species of marine teleost fish. Cryptocaryon irritans that fall to the seabed or aquarium bottom in winter can form “dormant tomonts” and wake up when the temperature rises the next year. Abundant...

parasitesandvectors.biomedcentral.com

So, the short answer, if you are referring to cryptocaryon, is no. They appear to be dependent on surface proteins of their host organisms.
(there is no marine parasite called velvet).

 

[qasimja]

not they cannot they need a fish to host they cant survive on inverts or coral

 

[gill]

That is the entire point of the fallow period: no fish. Inverts and coral are fine. In fact, many people "ghost feed" during fallow, in order to keep bio filter going.