Worms?

[fishboy1232]

tuesday, my teacher told me that there were worms on her fish. She told me that the worms were hanging on the side of the fish(feeder fish that looks like goldfish) and in the fish bloodstream.

can you help me out?

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

What colour were the worms.
Did they have a forked tail.