Card 1 — The Goal
🐟 The 10-Gallon Rule: Counterintuitive but true: bigger is EASIER. A 10-gallon tank dilutes beginner mistakes; tiny bowls spike ammonia overnight. Fill with dechlorinated water and run the filter 24 hours before anything swims.
Your First Tank: 5 Steps to an Aquarium That Doesn't Crash
Card 2 — Step 1
🔧 The $27 Priority List: Skip the castle décor — spend on a $15 sponge filter and a $12 adjustable heater. Stable temperature and gentle filtration prevent 80% of beginner fish deaths.
Card 3 — Step 2
🦠 The Ghost Fish Cycle: Add bottled bacteria, then 'feed' an imaginary fish a tiny pinch daily. Test ammonia every 48 hours; when it reads 0 ppm consistently, the tank is safe for real fish. Skipping this step is why first fish die in week one.
Card 4 — Step 3
🐠 The Beginner-Proof Roster: White cloud minnows and zebra danios forgive mistakes and thrive anywhere from 18-24°C. Save the delicate showstoppers for tank number two.
Card 5 — The Cheat Sheet
🪣 The Sunday 25%: A 25% water change every Sunday with a $10 siphon, new water matched within 1°C. Temperature shock from careless refills kills more fish than dirty water does.