Lesson 3: How Much and How Often to Feed
Lesson 4 · 5 min · Feeding & Nutrition
Less Is More (Seriously)
This lesson might save you more headaches than any other in this course. Overfeeding is the single most common mistake guppy keepers make, and I was definitely guilty of it. Your guppies will always act hungry — that's just how fish are. Learning to ignore their begging faces is a skill.
How Much to Feed
The golden rule: only as much as they can eat in about 2 minutes.
That's it. If there's food still floating or sinking after 2 minutes, you gave too much. Here are some reference points:
- A guppy's stomach is roughly the size of its eye
- For 5-6 guppies, start with a tiny pinch of flakes — literally between two fingers
- It will look like you're not giving enough. You probably are.
How Often to Feed
For adult guppies:
- Once or twice a day is perfect
- If feeding twice, make each portion even smaller
- One fasting day per week is beneficial (I do Sundays)
For guppy fry (babies):
- 3-4 times daily in very tiny amounts
- Their tiny stomachs need frequent small meals
- Crushed flakes or baby brine shrimp work great
What Happens When You Overfeed
I learned all of this firsthand:
- Uneaten food rots → ammonia spike → sick fish
- Cloudy water → bacterial bloom from excess nutrients
- Algae explosion → excess nutrients fuel algae growth
- Bloated fish → digestive problems, constipation, swim bladder issues
- Dirty substrate → more cleaning work for you
What Happens When You Underfeed
Honestly? It's pretty hard to underfeed guppies unless you're genuinely forgetting to feed them for days. A healthy guppy can go a week or more without food (though I don't recommend it). If you're going on a short weekend trip, they'll be perfectly fine without food for 2-3 days. Those vacation feeder blocks are unnecessary and can actually foul the water.
Practical Tips
- Watch them eat — especially at first. This tells you the right amount.
- Remove uneaten food — if you overshoot, scoop out what's left with a small net.
- Feed at the same time each day — guppies learn routines and it's fun to watch them get excited.
- Turn off the filter briefly during feeding — this prevents food from getting sucked away before fish can eat it (optional but helpful with strong filters).
What I Wish I'd Known
It took me weeks to stop overfeeding. Every guide says "feed less than you think" and every beginner ignores it. I'm telling you from experience: when in doubt, feed less. Your fish will not starve. Your water quality will thank you.