Goldfish get along with many types of peaceful Freshwater Fish; basically anything that won't eat them. However, goldfish should not be kept with most of the fish you find in a pet store, because they are coldwater fish, and require a lower temperature than most fish. Thus the only suitable tankmates are other coldwater species, which are few and far between.
Rudd, Orfe, some species of Catfish will all be OK in cold water with Goldfish.
Some of the most common species of freshwater tropical fish are guppies, various tetras, platies, swordtails (a relative of platies), various corydoras catfish, various species of plecostomus, and angelfish.
According to the list of ingredients on the (cheddar) Goldfish Cracker package, there is no MSG. See site with list of ingredients, below.
Many many many fish get along with guppies. Guppies are very peaceful live bearing fish. They breed readily in the aquarium and quite prolifically if left unchecked. Some suggested tank mates are, most kinds of tetras (not all), rasboras, danios, platys, mollies, swordtails, cherry barbs, gold barbs, just to name a few. Look up info online about guppies and most info will list suitable tanks mates.
There are over 300 different varieties of goldfish so to list them all would take a very, very long time. To name a few: there is the Common goldfish, the Comet or Pond goldfish, the fancy Oranda, the Cylestial, the Black Moor, the Ryukin, The Chinese Lionhead, the Japanese Ranchu, the Fantail, the Butterflytail, the Shubunkin, the Wakin, The Bubble-eye, the Globe eye, and the Telescope Eye. The goldfish listed above are only the most popular goldfish varieties and please note that along with the 300 different types of goldfish there are also a great many number of hybrid goldfish that are gradually gaining in popularity.
List classification of fish based on morphology
One can find a list of C Compilers, along with helpful information at several online sites. Some of these online sites with this information are "Cplus" and "Delorie".
Endangered fish should be protected and placed on the Endangered Species list.
Type into google acww fish list and it will show you.
list some unscale fish
Call Smith and Wesson and they will tell you. Post a detailed description and list the sn and someone will be along to help you if possible.
There is no breeding season. Male guppies will breed constantly. But sometimes they can get board with a female and not breed. So separate them for a bit then put them back together.