What makes you think an animal has to be in there in the first place? It could be a topiary. Just a bunch of exotic plants that the Captain maintains.
Because plants are not as interesting as cloaking animals and maybe in an alternate reality cryptic notices this post and adds a cloaking animal to the tank.
Also an animal being in there that inspired the cloaking device is a great idea.
Comments
It blends in so well that it appears to have "cloaked".
"My Crew"
"I'm surprised you're not worried about your fish" -Q
Because plants are not as interesting as cloaking animals and maybe in an alternate reality cryptic notices this post and adds a cloaking animal to the tank.
Also an animal being in there that inspired the cloaking device is a great idea.