Card 1 — The Goal
🪨 The Gravel Rinse: Choose fine gravel over sand (no toxic air pockets) and rinse it 5-7 times until the water runs clear. Cloudy-tank misery is decided before the first drop goes in.
Crystal-Clear Water: 5 Aquarium Habits That Prevent Every Crisis
Card 2 — Step 1
🧽 The Old-Water Sponge Rule: Rinse filter sponges every 2 weeks in the OLD tank water you just siphoned out — never tap water. Chlorine kills the good bacteria doing all your ammonia control for free.
Card 3 — Step 2
⏱️ The 45-Second Feed: Feed only what disappears in 45 seconds. Overfeeding is the #1 cause of cloudy water and algae — most fish problems are actually food problems.
Card 4 — Step 3
💡 The 6-Hour Light Timer: A $12 outlet timer capping lights at exactly 6 hours a day cuts algae roughly in half within two weeks. No chemicals, no scrubbing marathons.
Card 5 — The Cheat Sheet
🧪 The Monthly Four-Test: Once a month: ammonia, nitrite, nitrate, pH. Nitrate over 40 ppm means bump water changes to 30%. Five minutes of testing catches every disaster while it's still cheap to fix.