Lyrics are as follows:

Orange colored mollies and black colored guppies
Shy little angels as gentle as puppies
Swimming and diving with scarcely a swish
These are a few of my tropical fish

Then I bought Mantas that sting in the water
Deadly piranhas that itch for a slaughter
Savage male betas that bite with a squish
Now I have many less tropical fish.

If you think that
Fish are peaceful
That's an empty wish
Just dump them together and leave them alone
And soon you will have... No fish.