How Many Feeder Fish Do You Actually Need?
Order too few and you run out mid-week; order too many and they foul your tank. Here is how to size your feeder order to your predators — with a free calculator to do the math.
The two most common feeder mistakes are opposites: ordering so few that you run out and resort to a stressful store run, or ordering so many that uneaten fish overload your tank. The right number sits in between, and it is easy to estimate once you know three things.
The three variables that matter
- Species — appetite differs hugely between a pea puffer and an arowana
- Size — a juvenile eats a fraction of what a full-grown adult does
- Feeding frequency — most predators do well on two to four feedings a week, not daily
Multiply feeders-per-meal by meals-per-week by the number of predators and you have your weekly need. Double it for a two-week buffer and you have your order size. That is exactly the math the calculator below runs for you.
Skip the math — use the calculator
Pick your species and size to see how many guppies you need per feeding, week, and month, plus the right bulk pack or subscription.
Your setup
Predator size
Estimates assume 3 feedings per week. Adjust to your own routine — appetite varies with temperature, age, and the individual animal.
You'll need about
6
per feeding
18
per week
36
per 2 weeks
77
per month
feeder guppies for 1 oscar / large cichlid at medium / adult size.
Best one-time pack
Guppy Feeder Fish — 50 Pack
$59.99 · 50 fish · $1.20/fish — about a two-week supply.
View this packBest subscription
Nano Plan
$53.99 every 2 weeks · 50 fish — auto-delivered so you never run out.
See this planRound out the diet: for oscar / large cichlid, we suggest sinking pellets 2–3× weekly. See the food we recommend →
Pro tip
Feeding several small guppies beats one oversized meal — it lets your predator hunt repeatedly, which is healthier and more natural.
Why a two-week buffer is the sweet spot
Buying roughly two weeks of feeders at a time hits the best balance of price and freshness. You reach the lower per-fish bulk pricing without holding so many fish that your tank struggles. Keep them in a cycled holding tank and gut-load them in the days before feeding.
Feed to the animal, not the calendar. The estimate gets you in the right ballpark; your predator’s belly and energy fine-tune it.
Recommended
Guppy Feeder Fish — 100 Pack
The everyday workhorse pack — about two weeks of food for several hungry predators.
$104.99· $1.05/fish
Once you know your number, a bi-weekly subscription is the easiest way to never run out — it ships your two-week supply automatically and you can skip or pause anytime.
Frequently asked questions
How many feeder guppies should I buy at once?
About two weeks’ worth. Use the calculator to find your weekly need, double it, and order the nearest bulk pack.
Will extra feeders survive until I need them?
Yes — in a cycled holding tank with a sponge filter and heater, guppies stay healthy for weeks and even become more nutritious as you condition them.
Is it cheaper to buy in bulk?
Much. Per-fish price drops from $1.20 on the 50-pack toward $0.70 on larger packs and subscriptions. See the pricing breakdown.
Ready to stock up?
Healthy, gut-loaded guppy feeders in bulk packs and bi-weekly subscriptions — live arrival guaranteed.
Questions about this guide? Email [email protected]
