GLASS & GILL KNOWLEDGE HUB

Every great aquarium begins with understanding.

Fishkeeping rarely starts with mastery. It starts with a tank, a question, a mistake, a moment of fascination. The Knowledge Hub is where those moments connect—where the beginner learns why a tank cycles, the growing hobbyist learns how to shape a stable system, and the experienced keeper begins to think in terms of behaviour, ecology and balance.

Begin your journey Follow a species path
136published guides
11learning paths
1connected aquarium library
FIND THE ANSWER FASTER

What do you want to understand?

Search the Glass & Gill library by the question in front of you. Start with the thing you are trying to solve, then follow the guides as deep as you need to go.

Try: cycling · algae · Betta tankmates · shrimp GH · plants · CO₂ · filtration

CHOOSE YOUR DEPTH

There is no single way into the hobby.

Some people arrive with an empty tank and a hundred questions. Others arrive after years of keeping fish and discover there is still more to understand. These three paths are not ranks. They are simply different places in the same journey.

01 THE FIRST QUESTIONS

Beginner Aquarium Foundations

Learn how cycling, water quality, stocking, feeding and maintenance work together. Build the routines that keep the aquarium stable, predictable and healthy, so every decision that follows rests on a stronger foundation.

Explore 12 guides →
02 WHEN THE BASICS BECOME INSTINCT

Intermediate Aquarium Mastery

Learn how flow, planting, filtration, stocking and maintenance work together. Build the judgement to balance competing needs, recognise patterns early and manage the aquarium as one connected system rather than separate parts.

Explore 12 guides →
03 WHEN THE AQUARIUM BECOMES A SYSTEM

Advanced Aquarium Mastery

Learn how CO₂, nutrients, circulation, water chemistry and bioload work together. Build the precision to manage interactions, anticipate long-term changes and keep the aquarium stable as the system becomes demanding and complex.

Explore 12 guides →
WHAT ARE YOU TRYING TO SOLVE TODAY?

Sometimes you do not need a level. You need an answer.

Fishkeeping problems rarely arrive in neat categories. When something needs attention now, start with the question that brought you here and move outward from there.

01Starting a new aquarium

Understand the cycle before livestock goes in, and build the biological foundation the rest of the tank depends on.

Read the cycling guide → 02Understanding your water

Make sense of pH, ammonia, nitrite, nitrate and the numbers that tell you what is happening beneath the surface.

Understand water parameters → 03Choosing filtration

Choose a filter for the aquarium you are building—not simply the largest flow-rate number on the box.

Choose the right filter → 04Planning your stocking

Think about adult size, behaviour, swimming space and bioload before a collection of fish becomes a conflict.

Plan your stocking → 05Fighting algae

Look beyond quick fixes and trace algae back to the balance of light, nutrients, maintenance and plant growth.

Work through the algae guide → 06Something keeps going wrong

When the same problem returns, stop treating the symptom and start reading the system that keeps producing it.

Diagnose the pattern →
SPECIALIST HUBS

Then the hobby becomes personal.

Eventually, most aquarists stop wanting to know everything in general and start wanting to understand something deeply. A species. A behaviour. A river. A way of building an aquarium around the needs of the animals inside it. These specialist paths are where that deeper relationship begins.

SPECIES FOCUS · 12 GUIDES

Everything Betta

A Betta can be someone's first fish and still teach an experienced keeper something new. Follow the species beyond bowls and myths into behaviour, environment, feeding, compatibility and the details that make an individual fish thrive.

Enter the Betta hub →
SPECIES FOCUS · 12 GUIDES

Corydoras

Corydoras change the way you look at the bottom of an aquarium. Their social behaviour, constant foraging and subtle species differences reward keepers who learn to see the tank from their level.

Enter the Corydoras hub →
SPECIES FOCUS · 12 GUIDES

Freshwater Shrimp

Shrimp reveal the small world inside the aquarium. Biofilm, minerals, moulting, grazing and tiny shifts in stability suddenly matter—and a planted tank starts to feel like an ecosystem rather than a display.

Enter the Shrimp hub →
PLANTED AQUARIUMS · 16 GUIDES

Aquatic Plants

Plants turn the aquarium into a living landscape. Learn how to choose species, match light and CO₂, understand growth habits, solve common problems and build planting that becomes better with time.

Enter the Plant hub →
Pleco care and species guides
SPECIES FOCUS · 24 GUIDES

Plecos & Ancistrus

Explore L-numbers, Bristlenose and specialist Loricariidae with species-specific guidance on adult size, diet, suitable habitat and aquarium care.

Enter the Pleco guides →
Freshwater Angelfish
SPECIES FOCUS · 12 GUIDES

Angelfish

Plan for the adult fish: height, territory, pairing, tank mates, feeding, water and planted-aquarium structure.

Enter the Angelfish hub →
BIOTOPE FOCUS · 6 GUIDES

African Biotopes

African freshwater aquariums ask you to think in landscapes: rock, territory, chemistry, aggression and the extraordinary variety that evolved across the continent's lakes and rivers.

Enter the African hub →
BIOTOPE & SHOWCASE · 6 GUIDES

Amazon & Large Showcase Fish

The Amazon path widens the scale. From warm, intricate community systems to fish that eventually demand enormous space, these guides are about planning for the animal it will become—not simply the animal you bring home.

Enter the Amazon hub →
FROM READING TO A BETTER AQUARIUM

Knowledge changes the way you build.

01Understand

Before equipment, livestock or décor, understand what the aquarium is being asked to do—and what the animals inside it will eventually need.

02Choose

Once the needs are clear, choices become easier. Species, filtration, plants and layout stop being isolated purchases and start becoming parts of one plan.

03Build

Only then does the aquarium come together—one decision supporting the next, with fewer compromises and far fewer surprises later.

PUT THE KNOWLEDGE TO WORK

When you are ready, turn the idea into an aquarium.

The Knowledge Hub is not meant to end with more reading. Its purpose is to help you reach the point where the next step feels obvious—because you understand why you are taking it.

01Freshwater FishShop livestock → 02Aquatic PlantsShop plants → 03FiltrationShop filtration → 04Water TreatmentShop water care →