What can you call a sucky fish?

This is a fun question! Here are some options, playing on the word "sucky":

Humorous:

* A fishtastic flop

* A fin-tastic failure

* A real guppy (playing on "guppy" being a small, common fish)

* A sucker for the bottom (if it's a bottom feeder)

* A real dodo of the deep

More descriptive:

* A weak swimmer

* A struggling fish

* An unhealthy fish

* A fish in distress

Punny:

* A fishie with a bad attitude

* A real fish-tastic disappointment

* A fish with a bad case of the "sucks"

Ultimately, the best name depends on the context and your sense of humor!