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109 results for “tropical fish”
What Water Conditions Do Tropical Fish Need?
Tropical fish prefer warm water at 23-30 C (use a heater when it drops), a pH of 6.0-8.0, and moderate hardness. Never use tap water directly; dechlorinate and air it for 2-3 days first.
Can Goldfish and Guppies Live Together?
Goldfish and guppies aren't a good mix. Goldfish are long-domesticated with weak immunity, so even alone they fall ill easily; with guppies, bacterial cross-infection can kill the goldfish. They also differ in temperature, water needs, and size — a large goldfish can accidentally harm a tiny guppy. Keep goldfish in a low-density single tank; guppies pair better with small tetras, platies, mollies, or moonfish.
What Are the “Old Three” Fish-Keeping Remedies?
The "Old Three" is a classic, must-know technique every fish keeper should learn, and the go-to treatment when fish fall ill. It rests on three simple, low-stress steps: water change, raising the temperature, and adding salt. Regular water changes flush out waste, pathogens, and parasites to keep the tank clean. A modest temperature bump speeds up the fish's metabolism and boosts its immunity. Salt—used at a low concentration—shifts the water's osmotic pressure so bacteria struggle to enter the body and the fish's organs work less hard. Together these measures support recovery and protect your fish's long-term health.
Aegean Killifish
The Aegean Killifish (Aphyosemion celiae) is native to West Africa and shaped like the harp killifish, 6-7 cm long. It likes weakly acidic water and higher temperature (optimal 24-28 C), eats live foods like bloodworms and artemia, and is hardy and easy to keep.
Platy (Moonfish)
The Platy (Moonfish, Xiphophorus maculatus) is a common tropical fish. Like the guppy it is small and comes in many colors, beloved by aquarists. With strong adaptation and breeding ability, it is easy to keep.
Featherfin Bannerfish
The Featherfin Bannerfish (Heniochus chrysostomus), mainly from the Indo-Pacific coral reefs, is also called the Feather Knife. Named for its feather-like tall dorsal fin, it eats invertebrates and coral polyps, so care is needed in the tank.
Triangle Butterflyfish
The Triangle Butterflyfish (Chaetodon triangulum) is native to the coral reef waters of the Indian Ocean and is very beautiful. As a marine fish it is somewhat challenging, so providing suitable saltwater conditions is essential.
Brown Surgeonfish
The Brown Surgeonfish, also known as the Algae-eating Surgeonfish or Lavender Tang, is a tropical marine fish named for its lavender-purple anal and caudal fins. Reaching up to 21 cm, it inhabits the Indo-Pacific and feeds mainly on algae.
Vagabond Butterflyfish
The Vagabond Butterflyfish is a small reef fish, 80 to 120 mm long and quite rare. It is mainly found in tropical warm waters of the Indian and Pacific Oceans. Because of its small size, it should not be mixed with aggressive fish.
Copperband Butterflyfish
Also called the Three-banded Rocket or Short Rocket, the Copperband Butterflyfish is mainly distributed in the Philippines, Singapore, and the South China Sea. Its gentle nature and long, slim snout make it very popular among aquarists.