ref https://en.wikipedia.org/wiki/File:Guppy_breeds.jpg

ref https://en.wikipedia.org/wiki/File:Freshwater_angelfish_biodome.jpg

quick photo study (ref)

Seahorses are neat. They're technically fish

(ref: everything on the first few pages of image search for seahorse)

don't feel so good today. drew this clownfish

Moonfish are big and fast and the only known completely warm-blooded fish

ref: 1, 2

ref https://commons.wikimedia.org/wiki/File:Cardinal_tetra.jpg