Feeding & Nutrition

Comet came home in a plastic cup from the strip-mall pet store, the kind of place that keeps the fish next to the registers so you notice them on the way to the dog food. I carried him three blocks in my coat pocket, cup wobbling, and set him up in a five-gallon tank by the window that night feeling properly responsible for the first time in weeks. He was a half-moon betta, deep red with a tail like torn velvet, and he flared at his own reflection in the cup during the walk, which I took as a good sign. It was not a sign of anything except that bettas flare at everything.

For the first four days he did not eat a single pellet. I tried the food the store gave me, a flake that turned the water cloudy. Then a fancier pellet I read about online, the kind with the shrimp picture on the bag. Then live brine shrimp I drove twenty minutes to buy from a guy who kept a basement full of tanks and talked to me about pH for forty minutes. Comet drifted to the top, looked at the food, and turned away every time. The water was warm at seventy-eight degrees. The filter hummed softly. The light above the tank was one of those bright clip-on LEDs that makes everything look like a hospital corridor at two in the morning.

It was my neighbor, of all people, who figured it out. She keeps discus, which are the drama queens of the fish world, and has opinions about everything aquatic. She leaned over the tank one evening and said, "You've got him lit up like a stage, and that filter's pushing him around." She was right on both counts. Comet flared at his own reflection in the glass whenever the light hit it square, and the current from the filter kept sweeping him toward the back corner, where he'd hide behind the heater and refuse to come out at feeding time.

What actually changed

I dimmed the LED to maybe a third of its brightness and angled it so it didn't glare off the front glass. Then I taped a little baffle over the filter outlet using a clean sponge cut to size, which softened the flow to almost nothing. The tank went from a spotlight to a dim, calm room, the kind of place a small fish might actually want to eat in. I also slid a piece of dark paper behind the tank so the back wasn't a mirror of the bright window behind me.

That night he ate. Not a lot, just three pellets, but he came to the surface and took them the way a betta should, with that quick suck-and-spit motion that means the food is worth keeping. By the end of the week he was meeting me at the glass when I walked past, fins spread, begging like a dog. The change was that immediate, and I felt a little foolish for the brine shrimp road trip.

I'd spent the better part of a week convinced I had a sick fish and reading forum posts about internal parasites. Turns out he was fine. He just hated the lighting and the current. Bettas are still-water fish from rice paddies and shallow ponds, not rushing streams, and a bright overhead lamp reads to them as exposure, like being caught in the open with no cover. The reflection thing is real too. They see a rival in the glass and decide the top of the tank is dangerous, so they stop going up for food, exactly where the pellets float.

If you've got a betta who won't eat, before you reach for medication or special foods, look at the tank the way the fish sees it. Soft light. Still water. No glare from a window or a bulb behind the glass. I keep a floating leaf now, a little plastic one anchored with a stone, and Comet rests under it like it's a lily pad, watching the room with one eye. He's two years old and still flares at his own reflection on bright mornings, but he eats every day, and that's the part that matters. The whole fix cost me nothing but a sponge and a dimmer switch.

The expensive brine shrimp went to the guppies in the other tank, who were never picky to begin with and appreciated the gesture. Comet, for his part, has no idea he caused a week of worry. He just sits under his leaf and waits for the pellets, which now land in water he actually wants to be in.

The other thing I changed, almost as an afterthought, was the water itself. I'd been doing small weekly changes, but I started testing with a strip kit and doing a twenty-percent swap twice a week, siphoning from the corner Comet liked to hide in. Cleaner water meant he was at the surface more, which meant more chances to eat, and the whole tank settled into a rhythm. If I could tell a beginner one thing, it's that the fish usually isn't the problem. The tank is. Fix the room the fish lives in before you fix the fish, and nine times out of ten the eating sorts itself out.