I have a 29 gallon tank with a single Undulated Triggerfish. I have some experience with them and know that they are very aggressive fish. The Undulated is about two inches in size right now and will eventually "graduate" to a larger 55 gallon, but can't go in there yet due to the fish/eel in there being larger.
I'm looking for suggestions on a fish that won't be destroyed by the Undulated. I'm not opposed to another eel (already have a fairly large Snowflake Moray) but my preference is toward a fish at this time.
I've had an undulated trigger. He has no business being is such a small tank.
Mine outgrew my adult humuhumu in one year and was as tiny as yours when I got him. He was compatible with the humuhumu for that time until he reached the same size and then he just snapped and I had to remove all other fish as he almost killed the trigger and rabbitfish (the rabbit was much larger than he was). This was in a 180 gallon! He ended up being able to live with my Zebra Moray and my 18 inch panther grouper. THat was all the fish I was able to keep in the 180 gallon with him. The moral: They are super belligerent and will not tolerate other fish for long.
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Plus, there is nothing that has any business in a 29 gallon that would be compatible, maybe a vampire dottyback but they are super aggressive as well and would take over such a small tank too. Things like large groupers or large puffers that might be OK are WAY too large for either tank you propose.
It makes me sick to think this poor baby is in such a small tank and even his "upgrade" tank is ridiculously small. He did come from the ocean you know. They are not bred in captivity. Image going form the ocean to his current holding cell ... Please plan on upgrading to something at least twice the size of the 55 gallon!
Ask your local pet store
