That is a subjective question and depends on a persons preferences. I love Discus so I would recommend them to anyone who is expert at keeping fish but I would strongly advise a beginner to start off with a sensible sized tank (about 36"x18"x18") with top glass, a heater/thermostat, a power filter, a thermometer and a light. Then I would suggest the beginner get a book on keeping fish and follow the advice given therein to set up the tank. The easiest fish to keep alive are probably guppies so I would advise you to buy some of them but all fish need basically the same things in captivity. The Neccessities of fishkeeping are a minimum of 1 gallon of water per inch of fish, a cycled filter and a weekly water change of at least 50%.
Freshwater fish can eat a variety of foods, including algae, plants, small invertebrates such as insects and worms, and other smaller fish. Their diet can vary depending on the species of fish and their natural habitat. It's important to provide a balanced diet for captive freshwater fish to ensure their health and well-being.
no some can make u sick
of course not beavers eat fish/dead things but they only eat gold fish and cray fish is not a such thing its cat fish
yes it can it can also eat fish from the sea
I think they eat little bugs.
Trots.
They only eat salt water fish.
The guppy is a fresh water fish.
Some species of crabs will eat minnows. Minnows are small saltwater and freshwater fish that other marine animals may eat also.
Freshwater fish derive small amounts of salt from their freshwater habitat. If you place a freshwater fish in saltwater, the difference in habitat will cause the fish to burst.
Because saltwater fish can only breathe in saltwater (as in the ocean) and freshwater fish can only breathe in freshwater (as in tap water.)
All freshwater fish don't mind alage at all. Many freshwater fish eat alage like plecos, and loaches. Which you can get at almost any pet store.