Green terror tank mates

Giant danios would work, if doing a convict; get a baby so it can't maul your GT.

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There are lots of options of medium sized, but hardy cichlids to choose from

Off the top of my head Amphilophus Longimanus, Herichthys Deppii, Andinoacara Pulcher, Cichlasoma Amazonarum, etc. are all examples of fish where your GT should be able to keep the upper hand, but not kill them

There are tons more, just be sure if you choose to add other cichlids to the tank, that it is plenty big enough, and has lots of hiding places

If i were you i'd go the regular dither route, a shoal of some kind

Oops, missed the part that said 55 gallon for some reason.

Yeah i'd definetly go the regular small dither route, no question.

I have a 6" male GT, with a male also 6" RD, a 4" female JD, 3" female Convict, 7" tinfoil Barb, and 8" Pleco in a 90 gallon. Occasional chase here and there but no fin damage or casualties so far. My Green Terror rules the roost.

On a side note though... I seperated my GT for a week, and changed the tank decor when I added the RD. he ruled for the week, until GT came back..... Almost immediate tank domination when my GT returned.

I've always thought acara's looked pretty good with them.

i have fam in vallejo lol

i would not keep a JD along with a Gt in a 55 ..maybe 2 in a 75 it might work but thats just my opinion.
i would throw in a 1 salvini and 1 convict.. 6 buenos aires tetras or columbian tetras and 2 bushy nose plecos

In such a small tank, I think one other fish may result in aggression. I would add at least two other fish to disperse the aggression. A convict would be an ok choice along with maybe a firemouth or similar sized cichlid. Also I had a setup (a 75) with the same filtration and don't take this wrong but the aqeuon 55/75 hobs are not that great once bio-load goes up.