Post here fish you already know won't get along...

[Honda12]

Anything small enough for my female stingray to kill, or anything to slow to get away.

 

[hewhorunswithscissors]

a group of mormyrus kanumme with themselves... you will end up with a bunch of mormyrids huddles int the corner starving to death while and one dominant fish rules the tank and gets fat and sassy...

 

[redtailfool]

Some synodontis cannot mix well with stingrays. They bother the stingrays and i
think i saw one suck the slime out of the spikes.

 

[Big Business]

leporinus and rope fish don't get along IME. the leporinus harasses the ***** out of the rope fish

 

[vanilla__gorilla__]

breeding pair of jags + any fish = dead any fish

 

[Jeox]

Giant bumblebee cat and other stuff of smaller size..

 

[ewurm]

RTBS and anything of a smaller size.

 

[Peanut_Power]

pink kissing gourami and algae....

 

[cburkhart78]

CRAYFISH AND SMALL PLECO

 

[guppy]

a group of mormyrus kanumme with themselves... you will end up with a bunch of mormyrids huddles int the corner starving to death while and one dominant fish rules the tank and gets fat and sassy...

Cool, I did not know that!