Aquarium Guides

Essential knowledge for every fishkeeper - from beginner basics to advanced techniques.

Best Aquarium Heater for a 20 Gallon Tank

What wattage a 20 gallon really needs, how a cold room changes the answer, and the buying criteria that separate a good heater from a cheap one.

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Best Aquarium Heater for a 5 Gallon Tank

Equipment

6 min read

Best Aquarium Heater for a 5 Gallon Tank

Why nano tanks need more watts per gallon, which heater format actually fits a 5 gallon, and how to avoid cooking a betta.

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Best Aquarium Heater for a 10 Gallon Tank

Equipment

6 min read

Best Aquarium Heater for a 10 Gallon Tank

The 50 W standard, when to step up to 100 W for a hospital tank, and what to check before you buy a heater for a small aquarium.

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Best Aquarium Heater for a 75 Gallon Tank

Equipment

8 min read

Best Aquarium Heater for a 75 Gallon Tank

Why 75 gallons is the point to split into two heaters, how to place them along a four-foot tank, and what build quality is worth here.

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Best Aquarium Heater for a 55 Gallon Tank

Equipment

7 min read

Best Aquarium Heater for a 55 Gallon Tank

One 300 W heater or two 150 W units? The honest trade-off on a four-foot 55, plus wattage for warm and cold rooms.

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Species

9 min read

Types of Loaches: 7 Species & Care Needs

Kuhli, clown, yoyo, hillstream, weather, dwarf chain and rosy loaches compared — real tank sizes, temperature, pH and group minimums from our database.

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Species

14 min read

Types of Cichlids: 36 Species by Category

Every cichlid type worth knowing, grouped into New World, dwarf, African rift lake and centerpiece species — with real tank sizes, temperament and pH.

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Species

12 min read

Types of Tetras: 26 Species Compared

Every popular tetra species compared side by side — neon, cardinal, ember, rummy-nose, congo and more, with honest picks for community, blackwater and dither roles.

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Species

10 min read

Best Nano Fish: 15 Species for Small Tanks

The 15 best nano fish for 20–60 L tanks — chili rasboras, CPDs, ember tetras, scarlet badis and more, with real tank sizes and behaviour notes.

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Species

9 min read

Best Algae Eaters: 10 Species That Actually Work

Which algae eater actually works for your algae type and tank size — otos, bristlenose, amanos, nerites and the one common species we tell you to skip.

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Species

11 min read

Types of Plecos: 9 Species & Tank Sizes

Nine pleco species compared — from the 10 cm clown to the 45 cm common — with real adult sizes, tank minimums, temp and pH from our database.

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Stocking

16 min read

Best Fish for a 200 Gallon Tank

The largest home aquariums — fire eels, knifefish, frontosa colonies and piranha shoals with room to spare.

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Stocking

16 min read

Best Fish for a 180 Gallon Tank

A statement monster tank — fahaka puffers, big cichlid colonies and deep piranha shoals.

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Stocking

15 min read

Best Fish for a 150 Gallon Tank

Monster-keeping territory — frontosa colonies, piranha shoals and true predator displays.

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Stocking

16 min read

Best Fish for a 125 Gallon Tank

34 species that reward you for going big — where monster fish become manageable and dream setups become reality.

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Stocking

14 min read

Best Fish for a 120 Gallon Tank

A room-sized centerpiece — full-grown oscars, flowerhorns and archerfish with real estate to spare.

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Stocking

15 min read

Best Fish for a 100 Gallon Tank

32 species that flourish at this size — from discus groups to impressive cichlid communities.

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Stocking

13 min read

Best Fish for a 90 Gallon Tank

A true large-tank threshold — oscars, discus groups and big communities finally become responsible choices.

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Stocking

14 min read

Best Fish for a 75 Gallon Tank

30 species that make the most of this versatile tank size — from showstopper cichlids to massive schools.

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Stocking

12 min read

Best Fish for a 55 Gallon Tank

27 species that genuinely thrive in this popular tank size — from schooling tetras to stunning centerpiece cichlids.

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Stocking

12 min read

Best Fish for a 65 Gallon Tank

The tall alternative to a 55 — peacock cichlid displays and shark-and-barb communities that use the height.

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Stocking

11 min read

Best Fish for a 60 Gallon Tank

Where an aquarium becomes furniture — mbuna setups, medium cichlids and full communities.

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Stocking

11 min read

Best Fish for a 50 Gallon Tank

The sweet spot between starter and serious display — angelfish pairs, rainbow schools and dwarf cichlids.

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Stocking

9 min read

Best Fish for a 40 Gallon Tank

34 species that unlock at 40 gallons — Angelfish, Rainbowfish, and active swimmers that finally have room to thrive.

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Stocking

10 min read

Best Fish for a 30 Gallon Tank

37 species that genuinely thrive in a 30 gallon — from schooling tetras to centerpiece cichlids and active barbs. Honest picks based on adult size, bioload, and temperament.

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Stocking

8 min read

Best Fish for a 20 Gallon Tank

22 species that genuinely thrive in a 20 gallon — from schooling fish to centerpiece options. Honest picks based on adult size, bioload, and temperament.

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Stocking

5 min read

Best Fish for a 5 Gallon Tank

7 species that genuinely thrive in 5 gallons — not just survive. The honest guide to nano tank stocking.

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Stocking

6 min read

Best Fish for a 10 Gallon Tank

12 species that genuinely thrive — not just survive. Honest advice on what actually works in small aquariums.

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More guides coming soon! Have a topic you'd like us to cover? Let us know.