ConsideringBlue bettaBetta splendens
TankWise assessmentReview before buying
- TemperatureIn range
- Tank sizeSuitable
- Current residentsReview
Example assessment based on the aquarium details you enter.
Know Before You Buy
The app every aquarist checks before every new addition.
TankWise compares the fish, shrimp, snail or plant you're considering with your aquarium—its size, water, biotope and current residents—so you can understand the fit before you buy.
One complete tank freeEvery current tool includedFreshwater-firstYour real aquarium contextNo subscriptionOne-time unlimited unlock
Your aquarium
The new aquarium habit
From “I want it”
to “it fits.”
One clear sequence turns a fish-store impulse into a decision made with the full aquarium in mind.
- 01→Spot something new
Find a fish, shrimp, snail or plant you love.
- 02→Open TankWise
Choose it from the species library while you are still deciding.
- 03→Check your aquarium
Compare it with your water, stocking, tank size and biotope.
- 04→Understand the fit
See concerns, tradeoffs and changes needed before checkout.
- 05Bring it home
Add it to your livestock and keep caring from the same record.
01Tank + species fit
Will it belong in my aquarium?
See how adult size, temperament, social needs and habitat align with the tank you already have.
02Readiness right now
Is my tank ready today?
Check whether your entered water readings, available space and current stocking support another addition.
03A useful next step
What would I need to change?
Understand adjustments and tradeoffs before spending money—or putting livestock at risk.
Your aquarium, remembered
Your tank has context. Keep it together.
Save its size, water, biotope and current residents once. TankWise brings that real aquarium profile into every new-addition check, so the recommendation reflects the tank you actually own.
See how TankWise keeps your aquarium together01Your tank20 US gal
Planted community
+02Your water78°F · pH 7.2
Readings you entered
+03Your livestock14 residents
Tetras + corydoras
+04Next additionBlue betta
One candidate
Your fit assessmentReview before buying
Two conditions deserve a closer look before this fish joins the aquarium.
TemperatureStrong overlapAdult sizeSuitableTankmatesFin risk to reviewStockingNear your limit
Confidence needs an explanation
See the reasons, the limits and where your data stays.
No mystery score
Conditions and conflicts stay visible so you can make the final call.
Read the methodology →Your aquarium stays local
Your saved tank is designed to stay on your device, under your control.
Review privacy →Guidance, not a guarantee
Individual behavior and real-world care still require your judgment.
Read the limits →
Check the match before you buyThe cost of guessing
An $18 fish can become a $90 lesson.
The purchase price is only the start. Adult size, tank minimums, social needs, water overlap, waste load and predation risk can turn an impulse buy into a replacement tank—or a painful loss.
“The right question is not “Do I like this fish?” It's “Does this fish belong in the aquarium I have?”Check the match before you buy
Value after checkout
The check becomes a care plan.
Once your new resident comes home, add it to the same aquarium profile. Keep its health, your water and the history of the tank in one useful place.
- 01Add the new resident
- 02Record water tests
- 03Stay ahead of maintenance
- 04Keep photos and health notes
- 05Build a useful tank history
Questions worth answering
Built for the questions aquarists actually ask.
Start with a real question. Bring the answer back to your saved aquarium before the next purchase.
CompatibilityCan a Betta live in my community tank?Start with the aquarium you own, not a generic species chart.Explore the answer 
Tank readinessDo I have room for another school?Consider adult size, group needs and the livestock already present.Explore the answer 
At the fish storeHow do I choose a healthy fish?Know the signs to look for—and the reasons to pause—before purchase.Explore the answer 
TankWiseKnow before you buy. Care better after.Already thinking about your next addition?