Livestock · 8 min read
Feeding aquarium fish
Two minutes of food. Not a relationship.
How much to feed freshwater fish, how often, what to buy, and why leftover flakes are an ammonia problem — not a kindness.
Photo: Christian Ang / Unsplash
Overfeeding is the most common way a cycled tank goes cloudy. The fish will beg. Their stomachs are not the size of their eyes.
The two-minute rule
Feed what they finish in about two minutes, once or twice a day. Skip a day for adult community fish if you went heavy yesterday. Fry and bettas in small tanks are the exceptions — small meals, not piles.
If flakes hit the sand and sit there, you fed too much. Corys and shrimp will help. They will not process a banquet.
What to actually buy
| Livestock | Staple | Extra |
|---|---|---|
| Tetras, rasboras, danios | Micro pellets or crushed flakes | Frozen daphnia / baby brine a few times a week |
| Livebearers | Flakes + a bit of veggie matter | Frozen foods |
| Bettas | Betta pellets that sink slowly | Frozen brine, daphnia — not dried “color flakes” as the only food |
| Corys, bristlenose | Sinking wafers | Frozen bloodworms, blanched zucchini for the pleco |
| Shrimp | Biofilm + an algae wafer | Blanched spinach. No copper meds |
Species pages list diet in one line. Start at the fish database.
How often
- Community adults: 1–2 small feedings per day, or one feeding and a skipped day.
- Bettas: once or twice daily, count the pellets. They will eat until they look like a balloon.
- Goldfish: they will eat themselves sick. Small sinking meals, not floating feast flakes.
Vacation: adult tanks survive a weekend without a feeder block that pollutes the water. For a week, a trusted human with the two-minute rule beats a vacation feeder.
The ammonia connection
Uneaten food becomes ammonia. Ammonia becomes a cycle crash if the filter cannot keep up. Cloudy water after a feast is not mysterious — read why the water is cloudy and stop overfeeding.
If nitrates climb every week, it is stocking, feeding, or both. Run stocking and water change before you buy another “algae wafer variety pack.”
Related
- How to Keep Freshwater Shrimp
Neocaridina and Caridina: temperature, GH, copper, feeding, molting, and how they breed in a home tank.
- How to acclimate new fish
Float method vs drip acclimation for freshwater fish and shrimp — when to use each, and why bag water stays out of the tank.
- Choosing Compatible Tankmates
Temperament, water parameters, and adult size — what actually matters when mixing species, with a yes/no table for common store mixes.