The original tank you were asking about should be 75 gallons (US gallons) in order to house all those convicts. As was noted above, they do get pretty big on their own. A 75 liter tank, which by the way converts to about 19 US gallons, would barely be big enough for one grown convict.
Regarding the other fish you mentioned, I am guessing that you are referring to Vieja bifasciatum. N8dogg is correct when he says that they would need a 75 gallon tank just for one. If you wanted to try and keep them all together, you would probably need a 240 gallon tank, with some good-sized target fish to reduce aggression.
As far as your spelling goes, I notice that it improved dramatically in the last post. While correct spelling is not absolutely essential, it can make your writing easier to read and allows for less room for confusion, and that makes it a win-win situation for all concerned.