Raising Fry Successfully

This guide covers raising aquarium fry with practical steps for home aquariums. Fry die from starvation and dirty water more than predation — small frequent care beats elaborate gadgets.

For related reading, see drip acclimation and Breeding Freshwater Fish at Home.

First Week Critical

Keep fry in shallow warm water with gentle sponge filtration. Feed appropriately sized live foods 3–5 times daily in tiny amounts.

Remove uneaten live food before it decays if using excess brine shrimp — adjust portions instead of polluting.

Water Change Discipline

Daily 10–20% changes with matched temperature prevent nitrate poisoning in small volumes. Use airline siphon to avoid sucking fry.

Bare bottoms make mulm visible — vacuum lightly during changes.

Food Progression

Infusoria → microworms/vinegar eels → newly hatched brine shrimp → crushed flake/micro pellets as mouths grow. Transition when bellies stay round after feeding.

Species vary — cichlid fry may take powdered fry food earlier than betta fry.

Grow-Out Tanking

Split by size as aggression appears. Upgrade tank volume as biomass increases — stunting happens in overcrowded fry boxes.

Gradual introduction to main display when large enough to not fit in adult mouths.

Common Failures

Overfeeding dry food too early, skipping water changes because 'they're small', and power filter intakes without sponge covers kill entire spawns overnight.

Label tanks with spawn date — growth benchmarks help catch problems early.