Fish Care Guides

A species profile has to cover everything at once — origin, diet, temperament, parameters — which means it can only ever give a paragraph to the questions people actually get stuck on. This section is where those questions get a full answer. How many of a species can you really keep in a given tank, and in what ratio. What the fry need in their first fortnight and what eats them if you look away. Why a fish that is described as bulletproof still fails in your water. Which of the near-identical varieties in the shop tank you are actually looking at. Each guide is tied to a species profile in the knowledge base and goes deeper on one topic than the profile has room for. Start from the species you keep, or browse by the problem you are trying to solve.

Topic

Showing 6 of 6 guides

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Guppy Tank Size & Stocking Ratio

Guppy Tank Size & Stocking Ratio

GuppyTank size & stocking

How many guppies fit in a 40L, 60L or 100L tank, why the 2:1 female-to-male ratio matters more than the number, and how fry turn stocking into a moving target.

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Guppy Water Hardness: GH, KH and pH

Guppy Water Hardness: GH, KH and pH

GuppyWater & parameters

Guppies need hard, mineral-rich water. Soft water is the most common cause of clamped fins, faded colour and unexplained losses — here is what to test and how to fix it.

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Guppy Breeding & Raising Fry

Guppy Breeding & Raising Fry

GuppyBreeding & fry

Gestation, brood size, stored sperm, and what fry actually need in their first six weeks — including why your shop-bought female is already pregnant.

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Guppy Diseases & Health Problems

Guppy Diseases & Health Problems

GuppyHealth & disease

Guppy disease (Tetrahymena), Camallanus worms, columnaris and fin rot — how to tell them apart, and why modern fancy guppies die in their first month.

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Guppy Tail Types & Colour Strains

Guppy Tail Types & Colour Strains

GuppyVarieties & strains

Delta, veiltail, lyretail, double sword and the rest — plus cobra, tuxedo, mosaic and moscow colour strains, and which are actually easier to keep.

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Guppy vs Endler: How to Tell Them Apart

Guppy vs Endler: How to Tell Them Apart

GuppyComparisons

Poecilia reticulata and Poecilia wingei differ in size, fin shape and colour — but they interbreed freely, which is why most shop "Endlers" are hybrids.

ADA
Aqua One
Chihiros
Dennerle
EHEIM
Fluval
Oase
Seachem
Tropica
Twinstar
UNS
ADA
Aqua One
Chihiros
Dennerle
EHEIM
Fluval
Oase
Seachem
Tropica
Twinstar
UNS
ADA
Aqua One
Chihiros
Dennerle
EHEIM
Fluval
Oase
Seachem
Tropica
Twinstar
UNS
ADA
Aqua One
Chihiros
Dennerle
EHEIM
Fluval
Oase
Seachem
Tropica
Twinstar
UNS