Swimming Fishies.com · aquarium hobby
Practical aquarium care for freshwater and saltwater keepers. Species profiles, cycling and stocking guides, and gear notes with conservative tank sizes — not bowls and not impulse livestock.
Photo: Duc Viet Bui · CC BY-SA 4.0
Pillar
Bettas, tetras, livebearers, cories, and the coldwater truth about goldfish. Start with a cycled, heated tank that matches adult size.
Pillar
Clownfish and firefish can work in modest marine tanks. Yellow tangs need room to graze. Same nitrogen cycle, plus salinity.
Freshwater · Beginner
Betta splendens
Bettas are labyrinth fish that breathe from the surface, but they still need a heated, filtered aquarium — not a vase. A 5-gallon tank is a practical minimum for a single male.
Min. tank: 5 gal
Care notes →
Freshwater · Beginner
Paracheirodon innesi
Neon tetras are small Amazonian schoolers that look their best in a planted 10-gallon (or larger) tank with a proper group, dimmer light, and stable, clean water.
Min. tank: 10 gal
Care notes →
Freshwater · Intermediate
Carassius auratus
Goldfish are coldwater carp, not bowl ornaments. Fancy strains need tens of gallons and strong filtration; single-tail commons belong in very large tanks or ponds.
Min. tank: 30 gal
Care notes →
Saltwater · Intermediate
Amphiprion ocellaris
Ocellaris clownfish are among the more forgiving marine fish — but they still need a cycled saltwater tank, stable salinity, and marine-level testing. A 20-gallon tank can house a pair; 30 gallons is more comfortable.
Min. tank: 20 gal
Care notes →
husbandry
A fishless cycle grows beneficial bacteria before you add livestock. Test ammonia, nitrite, and nitrate until the tank can process a dose of ammonia in a day.
Read guide →
setup
A heated, filtered 20-gallon tank is a kinder first aquarium than a tiny kit. Cycle before you add fish, test your water, and stock slowly.
Read guide →
stocking
Inch-per-gallon is a myth. In 20 gallons, think in terms of adult size, schooling needs, waste, and swimming style — then stock less than the store display.
Read guide →Starter kits and test kits, written as buying notes rather than fake rankings. Affiliate links stay placeholders until you add real IDs.
