It may be a long time before I get the spelling right on this one
In many cases adjectives go after nouns. Why To jest ryba pomarańczowa is incorrect?
Because that would mean something like "this is a fish made of oranges". Please read "The Meaningful Position of Adjective".
Hahaha I wrote "orangkolora"... it's orangxkolora (note the gx) in Esperanto xD
Yes. The particle "to" replaces the verb "jest". You may like to read this thread .
hey, just wonder is ta ryba jest pomaranczowa incorrect??
You changed the subject of the sentence from a pronoun to a noun.