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If by "comet fish" you mean a comet goldfish, you should not put anything in with it unless you get a much larger tank. A comet goldfish can grow six inches or longer, and will need a larger tank. Any tankmates should be cold water fish, like the goldfish. Snails will also get along well with the fish, but might get eaten. If it is a marine comet fish, it will grow up to seven inches, and will also need a larger tank.
no koi fish do not need a lot of space 10 to 12 of them are often put into a small pond
how much space that daisy need
Because a comet is a single tailed goldfish, and can grow very long, it will need at least 30 gallons on it's own
not that much space..
What you need to look for is not particularly "freshwater" fish. What you need is Coldwater fish rather than Tropical fish. The coldwater species that may be available apart from all the different types of Goldfish. are Golden Orf, Rudd, Roach, and various catfish species too.
Sea lions need plenty of space, and lot of fish to eat.
a lot of space?
Only if you had a humongous tank, they need space.
they need there own space ,air,water and also food to live.
They need about 3 feet of space and they need yo mama to look out for them
Quite often, unless you buy a kit, aquariums only come with the bare basics. You will need to purchase a filter, an air pump for a bubble wand or stone, food, water conditioner, aquarium salt, a heater, an aquarium thermometer, air lines, and filter media. Fishkeeping can be an expensive hobby depending on the type of fish you choose to keep. Goldfish for example need 20 gallons for the first fish, and 10 gallons for each additional goldfish you add - this does not include single tailed goldfish which require much more space (comet or common), and Koi need at least 100 gallons PER fish.