The minnow flitted through the kelp, looking for food and taking little nips of the plants as it went by.
It shot towards a bug flailing on the surface, taking a brief look behind itself as it greedily consumed the little beetle.
Uh oh. The catfish from the other day, that the human with the little hook had released into the water. It was coming straight for it.
Swimming for its life, the minnow quickly turned into a small opening in the ground, a little tunnel of sorts. It watched the catfish swim away.
It decided to keep going down the tunnel, some weird impulse tugging it down. Further and further, until the last traces of sunlight vanished and it was just the minnow, the water, and the dark.
It kept swimming until it felt tired, when it stopped and let itself sink to the ground, realizing that the tunnel had stopped ages ago. It felt faint; it needed some food before it fainted.
So it swam about, vainly searching through the dark for some kind of sustenance, a plant, a bug, even a clutch of eggs to gobble up and fill its belly.
Weakly sifting through the mud, it brushed something round and squishy. Quickly, without thinking, it took a chomp, a putrid, acidic taste flooding its mouth.
It spit the offending chunk out of its mouth and quickly swam away.
Orbs-- glowing yellow orbs in the dark, lighting a small space. Eyes on a body of dark tentacles.
Glancing at the spheres in front of it, it spit another of slimy mucus on the missing chunk and emitted a bellowing roar.
It erupted from the ground in a burst of mud and seemed to scan the cave with its glowing eyes, tentacles knocking the minnow back.
A human in a funny suit, descending from the top of the cave, attracted by the noise. The monster saw it and examined the person, before flicking its tentacles-- a barb through the human's leg.
Quickly, it slumped over, and the beast swam towards it, wrapping it in layers of mucus and laying it with the rest of the orbs.
Seemingly satisfied with its work, it sank down into the mud once more and closed its eyes, a deep rumbling echoing through the cave. It shut its eyes, and the light was gone.
Meanwhile, the minnow, seemingly imbued with a second wind, found the tunnel on the wall and swam as fast as it could,
breaking through to the surface and taking a much-needed chomp out of a dead catfish on the surface.
Occasionally, the minnow still feels a rumble beneath its fins, the mud shifting on the ground, and it remembers a dark cave and a narrow tunnel, and it wheels off to another part of the lake.