01 · The fish
Plakat betta
Betta splendens
One male, on his own.
As a fish
A labyrinth fish: besides its gills, it can breathe air at the surface. From still, sluggish water in central Thailand: rice paddies, swamps and roadside ditches. Up to about 7 cm.
Behaviour
A bubble nester: the male builds a nest of bubbles at the surface and guards it alone. Males fight, so it is one betta per tank.
Its job here
The only fish, and the star. Short fins, quick and curious: the closest to the wild fish, and safe around the rough arch wood.
Facts
- Size
- About 7 cm (2.8 in)
- From
- Central Thailand
- Water
- 72 to 86 °F, pH 6.0 to 8.0
- In the wild
- Likely preys on small invertebrates
- Here
- Pellets, plus frozen daphnia or brine shrimp
Seriously Fish, Betta splendens
Short-fin betta
A planted cube for one plakat.
Planned and explained.
Scroll to see the plan
Here it is today.

Today
fishtank.cam
Two cubes, side by side.
A plakat on the left, a halfmoon on the right.
Light looks
Watch onlyThe dial
Admin
Live controlsWhere the waste goes
Nothing is wasted for long.
Where the waste goes
The betta makes waste.
Here is where it goes.
- The betta breathes and leaves waste. It sinks to the bottom.
- Bacteria break it down. Waste becomes ammonia, then nitrite, then nitrate.
- Plants feed on the nitrate. It is their food, so they grow.
- Leftovers feed algae. What the plants don't use, algae will.
- Snails and shrimp eat it up. They graze the algae off rock and glass.
Sources
Low tech
Slow plants, no added CO2.
What low tech means
Gentle light. No added CO2. Slow plants.
No added CO2
The plants live on the CO2 already in the water, so they grow slowly.
Gentle light
Bright light without CO2 feeds algae. Gentle light keeps it back.
Months, not weeks
Months to grow in; a trim about once a month.
The opposite is the showcase tank, a high-tech tank.
Grow
The light and the plants.
The light
Plants run on light.
A Chihiros WRGB II Slim 30 on legs, on the same day as its twin next door. It rises slowly, stays bright through the afternoon and evening, then fades to a faint blue moonlight.
- Sun–ThuDim from 11 amFull 2:30 pm to 10 pm
- Fri–SatDim from 12 pmFull 4:30 pm to midnight
A warm white from the red, green and blue channels.
CO2
Plants also need CO2.
A fine mist of bubbles, only while the light is on.
Sources
The scape
A planted tank is a small landscape.
Here: one rough arch of wood, two stones, open sand and eleven slow plants. The right half stays open water.
The hardscape
- Arch woodOne rough piece with a hole through it. A cave to swim through.
- Two stonesAt the foot of the wood, holding the ferns.
- UNS ControsandFine, pale sand for the whole floor. No soil.
Back
- Vallisneria spiralisBack left. Tall, thin ribbons that sway to the surface.
On the wood and stones
- Java fern TridentTied inside the arch. Narrow, forked leaves.
- Weeping moss, two tuftsOn top of the arch and around the hole. Hangs down like a willow.
- Mini Bolbitis, twoOn the stones. A soft, frilly fern.
- Bucephalandra Mini Dark Needle, twoOn the stones. Dark, narrow leaves.
- Bucephalandra Brownie BlueIn a crack of the wood. Bronze leaves with a blue sheen.
- Bucephalandra Arrogant BlueOn the wood. Deep green, blue-purple in the light.
- Anubias nana BonsaiLow on the wood, left. Small, round, dark leaves.
- Anubias nana PetiteAt the foot of the left stone. Tiny, tough leaves.
Front
- Cryptocoryne willisiiIn the sand, front left. A low rosette that spreads by runners.
Floating
- Salvinia cucullataTwo patches, held in a ring. Shade, and cover near the surface.
Day by day
Watch it grow.
A photo each evening since planting.
Water
Keeping it clean and safe.
Flow
Fish live in their own waste, so the water keeps moving to clear it away.
It leaves through slots in the back wall, passes the sponge, the media and the heater behind it, and comes back gently through a clear outlet.
Inside the filter
The real cleaning is done by bacteria.
They live on the sponge and blocks in the media tower and turn toxic waste into nitrate, which plants use as food.
Sources
Lily pipes
Two clear pipes do the plumbing.
One takes water out, the other brings it back.
The pipesHooked over the back glass
Intake guardTiny holes keep shrimp out
Surface skimmerPulls the film off the top, no power
RelieverSoftens the water coming back
Water tests
Clear water can still be harmful.
Healthy water: ammonia and nitrite at 0, nitrate under 20, pH steady, minerals steady.
Water changes
Fresh water resets the balance.
Changes dilute what the plants and filter can't remove. While the tank settles, they come often.
Temperature
Tropical fish need steady warmth.
A heater holds it near 74 °F, and a probe checks it around the clock.
Sources
Cycling
A new tank needs time before fish.
Sand brings no waste of its own, so the bacteria are fed a little pure ammonia instead. When they clear it in a day, the tank is ready.
Weeks 1 to 6
- Now wood, stones and sand in. No water yet.
- Water in dechlorinated tap water, heater at 78 °F, pump on low.
- Bacteria a starter bottle, then ammonia to 2 ppm.
- Plants in while it cycles. They help.
- Test every 3 days ammonia and nitrite, with pH, and nitrate once a week. Top the ammonia back up as it falls.
- Done when 2 ppm reads 0 ammonia and 0 nitrite a day later, two days running.
- Then a big water change, and the plakat goes in.
When the betta comes in
Once the water tests clean.
The plan
Stocking takes weeks, not days.
Each step waits for clean water tests.
- Tank on its shelf, done.
- Scape wood, stones and sand, done.
- Cycle water in, then until the tests read 0.
- Plants on the wood, during the cycle.
- The plakat once the tests stay clean.
Fish
But where is the betta?
A plakat: short fins, quick and bold, closest to the wild fish. He moves in alone, once the water tests clean.
Alone
Why no tank mates?
One betta, one tank.
Territorial
Bettas are territorial. Two males fight; that is how the Siamese fighting fish got its name. So it is one betta per tank.
Not a community fish
Other fish with long, flowing fins look like rivals to a male.
Room for one
Peaceful tank mates need a bigger tank, at least 10 to 20 gallons. This one holds about 7, so it is all his.
No shrimp either
In the wild, bettas likely eat small invertebrates, so small shrimp would look like food.
Feeding
Less food keeps the water clean.
Two or three pellets, once or twice a day, and one day off a week.
Care
The rest is a routine.
Livestock
One plakat betta.
Who lives here
Who lives here.
Scroll to swim through the tank with each one.
Setup
Tank setup.
The gear
The gear behind it.
A rimless glass cube with the filter, pump and heater hidden behind a black back wall. Above it, a thin light on legs; on top, a glass lid.
Automation
What runs on its own.
Home Assistant
The tank mostly runs itself.
Home Assistant and a few sensors handle the routine.
- LightBrightens, holds and dims on its schedule
- CO2Switched on and off with the light by Home Assistant
- TemperatureA probe watches it, with an alert if it drifts
- Leak alertA sensor on the stand's floor
- ShowsStorm and jungle shows on a schedule
- Pixel clocksAWTRIX clocks around the house show the tank's state
- RemindersThe filter left off, a water change due
- Camera privacyGoes private on request
The dial
How I control it.
A four-button dial beside the tank: turn it for brightness, tap it for looks and shows.
Want to try the controls? Ask Chum for access.
About
Why this tank.
About the tank
I'm Brendan, ChumtheWaters online.
This is the left-hand cube of a pair: a small planted tank for one plakat betta.
Its rough arch of wood was too sharp for long fins, so this cube gets the short-finned betta, and the halfmoon gets the smooth red wood next door. Eleven slow plants, no CO2.
Nothing is rushed. The water cycles first, and the plakat comes home once the tests stay clean.
Special thanks to my local stores, Aquarium & Reptile Depot and Exotic Aquarium.
The tanks
Five tanks, one house.
Photos
Gear list by tank
The parts behind each tank.
The full gear list and credits
Reference
The full gear list and credits.






