It depend on what species you plan to keep and how long you plan to keep it.
I'm no expert, but I'm guessing at least a thirty gallon tank, or maybe twenty gallons if its small and is alone in the tank
a tank with a filter make sre the tank is big because the fish can get up to 4 feet big
A baby catfish can be raised in a Tank or Aquarium.
It depends how big your Koi is and how big the Catfish is. If the catfish can fit in the Koi's mouth than it will get eaten.
No catfish is an aquarium cleaner. There is no such thing as a fish that will clean a tank.
Provided your tank is big enough. Minimum requrements are 1 inch of fish needs 1 gallon of water.
no
some can.
Yes if the other fish can fit into its mouth! My catfish recently ate the 5" cichlid in the 90G tank. The cichlid was a little bit larger than the catfish when I first bought it (about 4") about 1.5 year ago, now the catfish is 9".
yes, i have 4 freshwater catfish about 5 inches long in a 55 gal. tank.
Yes, as long as the gold fish is big enough not to be eaten by the catfish. Make sure the catfish is a cold water variety.No
Can you have three pictus catfish in a five gallon fish tank
I would recommend any of the Corydoras sp. for a small tank.