it's kind of a matter of personal opinion
i like them on a diet of:
frozen bloodworms
frozen brine shrimp
freeze dried black worms
beefheart
flake
and pellets
I mix and match so they never get bored
a parrot fishes diet is plankton
Jawless fishes are voracious feeders while cartilaginous fishes are predators with a various diet.
Yes, small fishes will eat shrimp as part of their diet.
skates, rays, and a variety of small fishes
Many of the reef fishes feed on sponges for their diet.
feeds on various fishes, other sharks, and garbage
They like crabs and shellfish, but they eat what ever they can find.
Krill and small fishes are the major portion of the Humpback whales' diet.
on my opinion fish do yes in deed eat snails but not all fish
A Surgeonfish's diet mainly consists of seaweed and other small fishes.
The diet of the cloudy catshark consists of molluscs, crustaceans, and bony fishes.
If this black ink is comming from the fishes vent (anus) you need to do some more water changes and also improve the fishes diet.