Your aquarium A calmer routine.
Keep track of observations, water tests, maintenance, and reminders — all in one peaceful place.
Everything you need. Nothing you don't.
Observe
Notice what's happening in your tank and keep a simple record of changes.
Test
Keep your water tests organized so you can see what's changing over time.
Maintain
Keep up with water changes and everyday tank care without the guesswork.
Remember
Get gentle reminders for the care your aquarium needs, when it needs them.
A simple routine for a healthier tank.
Create your tank
Add your aquarium once, then keep everything about its care in one place.
Track your aquarium
Log observations, water tests, maintenance, and changes as you go.
Keep it calm
Use gentle reminders to stay on top of routine care without feeling overwhelmed.
Built by PetYeti for calmer aquariums
CalmTank is a free aquarium-care companion from PetYeti — designed to make everyday tank care simpler, clearer, and more peaceful.