Aquarium Care Topics
Browse all our in-depth aquarium care guides — from the nitrogen cycle and water chemistry to feeding schedules and equipment.
Stocking by Tank Size
29-Gallon Aquarium Stocking Guide: Community, Cichlids & Planted Setups
Practical stocking formulas, vertical swimming zones, and dwarf cichlid combinations for a standard 29-gallon aquarium.
2026-09-18
Stocking by Tank Size
55-Gallon Aquarium Stocking Guide: Top Setup Ideas & Bioload Tips
Authoritative stocking strategies, footprint analysis, and bioload formulas for the standard 4-foot 55-gallon aquarium.
2026-09-18
Stocking by Tank Size
75-Gallon Aquarium Stocking Guide: Advanced Planning & Predators
Advanced stocking strategies, territorial boundary mapping, and filtration requirements for the standard 18-inch deep 75-gallon aquarium.
2026-09-18
Water Quality
Algae Bloom
Sudden green or cloudy aquarium water caused by a microscopic algae population explosion.
2026-05-25
Water Quality
Ammonia Spike
A dangerous rise in toxic ammonia levels, usually from incomplete cycling or a filtration crash.
2026-05-25
Equipment & Gear
Aquarium Filters Comparison: HOB, Canister, Sponge & Sumps
Educational guide comparing fundamental filtration architectures: Canister, HOB, Sponge, and Sump systems.
2026-09-18
Equipment & Setup
Aquarium Lighting
How to choose and schedule aquarium lighting for healthy fish, plants, and algae control.
2026-05-25
Setup & Maintenance
Aquarium Setup
A step-by-step guide to setting up a new freshwater aquarium, from an empty glass box to a cycled tank ready for livestock.
2026-08-26
Biotopes & Specialized Environments
Blackwater Aquarium
A complete guide to simulating the dark, tannin-rich, and highly acidic waters of natural jungle streams and rivers.
2026-08-26
Medication
Chloramphenicol
A broad-spectrum antibiotic with significant human-handling and antimicrobial-stewardship considerations, generally reserved for specific susceptible infections when appropriate alternatives are unsuitable.
2026-09-16
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The Aquarium Nitrogen Cycle: A Beginner's Guide
Understand the aquarium nitrogen cycle, beneficial bacteria, and how to safely cycle a new fish tank before adding livestock.
Filtration & Equipment
Filtration
How to choose, size, and troubleshoot aquarium filters for crystal-clear water and healthy fish.
2026-07-11
Diagnostics
Fish Disease Comparison Chart
A diagnostic reference to help you narrow down possible causes of your fish's symptoms by comparing common diseases side-by-side.
2026-09-17
Nutrition & Feeding
Fish Food
How to choose the right food type and feeding schedule for healthy fish and clean water.
2026-05-25
Behavior & Symptoms
Flashing
Fish darting and rubbing their body against surfaces, usually signaling skin or gill irritation.
2026-05-25
Behavior & Symptoms
Gasping at Surface
Fish repeatedly breaking the surface for air, usually signaling low dissolved oxygen or gill distress.
2026-05-25
Water Quality
Aquarium Heater
Green water algae blooms: causes, quick fixes, and long-term prevention.
2026-05-25
Diseases & Parasites
Ich (White Spot)
A protozoan parasite causing salt-like white spots that spreads rapidly through the whole tank.
2026-05-25
Fish Health & Disease
Loss of Appetite
Why fish stop eating, diagnostic steps, and treatment protocols.
2026-05-25
Setup & Maintenance
Marine Aquarium Setup
An introductory guide to the equipment, chemistry, and biological setup required for a successful saltwater fish-only or reef aquarium.
2026-08-26
Health & Disease
Marine Quarantine
An advanced quarantine protocol specifically designed for marine fish, focusing on eradicating highly lethal saltwater parasites before they enter a reef tank.
2026-08-26
Water Quality
Marine Water Quality
A specialized guide to the complex chemical interactions and required parameters for maintaining a stable marine or reef aquarium.
2026-08-26
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Managing Medication Residue in Your Aquarium
Learn how to safely remove medication residue from your aquarium water using activated carbon and water changes to prevent toxicity.
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Melting Leaves After Planting
Learn why aquarium plants experience melting leaves after planting and how to prevent it. A comprehensive guide to Cryptocoryne melt and other common plant melting issues.
Medication
Metronidazole
An antimicrobial medication used for susceptible protozoal and anaerobic bacterial infections, with treatment route and suitability depending on the suspected organism and fish condition.
2026-09-16
Setup & Maintenance
Nano Aquarium Setup
A specialized guide for setting up and stabilizing small-volume nano aquariums under 10 gallons.
2026-08-26
Freshwater Invertebrates
Neocaridina Shrimp Care & Breeding Guide
Essential water parameters, breeding cycles, biofilm nutrition, and molt issue troubleshooting for Neocaridina shrimp.
2026-09-19
Water Quality
Nitrate Levels
Safe nitrate levels for fish, symptoms of high nitrates, and how to lower them effectively.
2026-05-25
Nutrition & Feeding
Overfeeding
Feeding fish more than they consume, causing water fouling, bloat, and digestive problems.
2026-09-08
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Aquarium vs Pond Setup: Key Differences in Fishkeeping
Explore the key differences between aquariums and outdoor ponds. Learn about filtration, heating, and stocking rules for your pond fish.
Medication
Praziquantel
An antiparasitic medication used against susceptible flukes and tapeworms in aquarium fish, with treatment depending on the parasite, formulation, and fish being treated.
2026-09-16
Health & Disease
Quarantine
The standard protocol for isolating new aquatic life in a separate tank to observe for and treat illnesses before introduction to the main display.
2026-08-26
Medication
Scaleless Fish Medications
A practical guide to medication selection and treatment considerations for scaleless and otherwise sensitive aquarium fish.
2026-09-16
Aquascaping & Hardscape
Substrate
How to choose, layer, and maintain aquarium substrate for healthy plants, fish, and water chemistry.
2026-07-11
Diseases & Parasites
Swim Bladder Disease
A buoyancy disorder causing fish to float, sink, or swim sideways instead of staying level.
2026-05-25
Equipment & Environment
Temperature
Safe temperature ranges, heater selection, and preventing thermal shock.
2026-05-25
Water Quality
Water Change
The essential maintenance procedure for removing toxins and replenishing minerals in freshwater aquariums.
2026-07-11
Water Quality
Water Chemistry
A foundational guide to the essential chemical parameters of aquarium water and how they impact fish health.
2026-08-26
Water Management
Water Quality
The foundation of fish health. A complete guide to understanding and maintaining the chemical balance of your aquarium water.
2026-07-11