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I have read on this site of people keeping undulates in 40g's but you need to be warned that undulates are extremely aggressive fish that will not tolerate any other fish especially in a small tank AND that they tend to hide alot which means viewing will be limited.
If you are interested in a more social trigger then you could keep a picasso trigger in a 75g. Other triggers like pinktail, bluethroat, niger, etc, all get much bigger and/or need more swimming room so a bigger tank will be needed for them.
There is always the chance though, that any trigger may suddenly "turn" and kill any and all tankmates....
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