Dwarf Cichlid & Apistogramma Glossary

By Pet Zone SD Team, September 2026

The apisto hobby has its own vocabulary — dGH, cave spawner, F1, conditioning — and none of it is obvious if you're coming from community tanks. This glossary defines the terms you'll run into across our species, care and breeding guides, in plain language, with no assumed background.

Water Chemistry & Tank

dGH (degrees General Hardness)

A measure of dissolved calcium and magnesium in water. Apistogramma need soft water, generally 2 to 8 dGH, far softer than most municipal tap water. See water chemistry mastery for how to test and adjust it.

TDS (Total Dissolved Solids)

A parts-per-million reading of everything dissolved in the water, often checked alongside dGH to judge how soft a source water really is before you start blending it down.

RO/DI water

Reverse osmosis / deionized water, stripped of minerals, then blended back with tap water or remineralized to hit precise soft-water targets. The standard tool for breeders chasing exact parameters.

Blackwater

Tannin-stained, acidic water typical of the Amazon streams apistogramma come from. Recreated in a tank with driftwood and leaf litter rather than any additive alone.

Leaf litter

Dried leaves, usually Indian almond (catappa) or oak, added to a tank to release tannins, ease pH down slightly and feed the microfauna that fry graze on in their first weeks.

Sponge filter

A low-flow filter apistos tolerate better than a powerful hang-on-back. Gentle current matters more to them than raw filtration capacity, which is why frequent water changes do most of the real work. See water quality monitoring.

Biotope

A tank built to replicate one specific wild location's water chemistry, substrate and species list, rather than a general "South American" look.

Behavior & Breeding

Conditioning

The weeks-long process of feeding a breeding pair heavy live foods and doing frequent water changes to trigger spawning readiness. Covered in depth on each species' breeding guide.

Cave spawner

A fish that lays eggs inside an enclosed space, such as a clay pot, coconut shell or PVC pipe, rather than on open substrate. Nearly every Apistogramma species is a cave spawner — the documented exceptions are A. barlowi and A. megastoma, which mouthbrood their eggs instead.

Harem

One male apisto kept with multiple females, mirroring the polygynous mating system most Apistogramma species use in the wild, where a male holds a territory covering several female nesting sites.

Dither fish

Small, active schooling fish such as tetras or rasboras kept with apistos to signal that the coast is clear, which makes the naturally cautious cichlids bolder and more visible.

Nape

The area on top of a male apisto's head, often the first spot to flush with color during a territorial or breeding display, and the source of the "red-nosed" common name in cacatuoides.

Finnage

The extended dorsal, anal and caudal fin rays prized in species like cacatuoides. Full, trailing finnage is a sign of a healthy, mature, stress-free male.

Fry

Newly hatched offspring, free-swimming after about four to seven days and dependent on infusoria or microworms until large enough for newly hatched brine shrimp.

Hobby & Sourcing

F1

First-generation captive-bred offspring of wild-caught parents, prized for combining wild genetics with tank-raised hardiness. Sits between wild-caught and line-bred stock.

Wild-caught

Fish collected from their native habitat rather than bred in captivity. Often harder to acclimate but more genetically diverse than farmed lines.

Line-bred

Fish bred for generations within a closed group to fix a specific color trait or pattern, similar to how dog breeds are developed from a founding population.

Regional variant

A population of a single species that looks distinct because it comes from a different river system or tributary than the typical hobby form, even though it's the same species.

Morph

A color or pattern form of a species, whether a naturally occurring regional variation or a captive-bred selection such as double red.

Polychromatic

A species in which males from the very same wild population show multiple distinct color patterns, rather than one standard look that only varies by locality. Apistogramma mendezi is a documented example, likely so females can tell same-species males apart from a similar-looking neighbor.

Double red (Super Red)

A selectively bred color line that maximizes red coverage on the face and fins of a species such as cacatuoides. See the cacatuoides variants section for how it compares to wild-caught and black-stripe lines.