yes you can.
be careful the cat fish doesn't eat the goldfish if you have any and feed it feeder fish fish flakes or maybe even fiddler crabs. my catfish ate them
Yes.
What to feed a fish is not dependant on whether it was wild caught or captive raised, you feed a fish based on whether it is a predator, omnivore or herbivore. Though wild fish will more often need fresh foods, instead of prepared. At least when first aquired.
A catfish. Ba dum tish.
No, catfish is not a tropical fish.
They eat any type of fish that they can catch!
If you are keeping these fish together then you shouldn't be - they are not compatible. Some of these are tropical, some cold water and there are big size differences. The Bumblebee catfish are noticeably smaller than all of the other fish that you have mentioned and if you are going to put in a wild caught catfish then those guppies and catfish... and maybe the goldfish are going to disappear VERY quickly. You CANNOT keep these fish together. Separate immediately and do not put in a wild catfish, especially not a bullhead or channel.
Most catfish can be easily be feed a commercial straight from the feed store floating pellets , their diet has been studied extensively , Auburn university Aquaculture and a general look at " catfish aquaculture " on the net , there is more info than you can imagine , the biggest things are protein ; soybean and possibly fish meal [ made from the leftovers of fish or from fish that have no table value ] . The feed is made to float so they will loose their "bottom feeding habits". here is an article on growing catfish in a barrel !! http://www.kurtsaxon.com/foods007.htm
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, of course. They might even like it.
well in the wild they feed on bloodworms and things
no catfish can't vomit because all the fish around them would die of sickness.