Freshwater Community Tank

The classic mixed-species freshwater aquarium - tetras, corys, and gouramis living together in a peaceful community.

Difficulty: Beginner Tank Size: 20g+ Recommended: 55g Budget: $200-$800 Setup Time: 30 days

📖 Overview

A freshwater community tank is the classic hobby starting point. It hosts multiple compatible peaceful species - typically small schooling fish, gentle bottom-dwellers, and one or two centerpiece specimens. Well-planned communities are stable, beautiful, and forgiving of beginner mistakes.

💧 Essential Parameters

Temperature: 74-78 F. pH: 6.8-7.6. GH: 4-12 dGH. KH: 3-8 dKH. Ammonia: 0. Nitrite: 0. Nitrate: under 40 ppm.

⚙️ Key Equipment

Filter rated for 4-8x tank turnover per hour (HOB or canister). Heater 3-5 watts per gallon. LED light (basic full-spectrum). Substrate (sand or fine gravel). Live plants or decor providing hiding spots.

🔄 Cycling Process

Cycle the tank BEFORE adding fish. Add pure ammonia to 2 ppm daily. Beneficial bacteria will establish over 4-6 weeks. Ammonia and nitrite drop to 0; nitrate rises. Only then add fish - a few at a time.

🐟 Stocking Recommendations

Neon tetras (6+), rummy-nose tetras, cardinal tetras. Corydoras catfish (6+ of same species). Bristlenose plecos. Peaceful gouramis (dwarf, honey). Ram cichlids. Kuhli loaches. Avoid mixing with aggressive cichlids, tiger barbs, or fin-nippers with slow long-finned fish.

📅 Maintenance Schedule

Weekly: 25% water change, glass cleaning, filter media rinse (in old tank water, never tap). Monthly: prune plants, test all parameters, replace filter carbon if used. Every 3-6 months: deep gravel vacuum, evaluate equipment condition.

⚠️ Common Mistakes

Adding fish before cycling. Overstocking on day one. Choosing incompatible species. Overfeeding. Neglecting water changes. Buying fish based on appearance without checking adult size.