ok yep sorry I just meant like north of central america I know it is part of north america sorry about that lol
So getting out of the geography conversation I think the bichir complicates things a bit. Letting that dream go for a bit and focusing on big cichlids that work as a pair in there are synspilums, blackbelts, robertsoni, Texas, severums, red tiger motoguensis, blue tilapia, parrot cichlids, green terror, or snook cichlid. Some of these will work with the del some will not.
I wish I had this problem of an empty 180.
dude I would do oddball community maybe tire track orblack spot eels some smaller lower jaw bichirs like lap or endli datnoids and maybe an odeo pike for the top
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I have 3 Nigerian Lapradei, 2 Spotted Silver Dollar, Delhezi, Endlicheri, 1 African Peacock and a now large Datnoid in a 180 gallon.
I understand wanting more active fish around it. I am just not sure on the bichir. I am concerned some of these fish will pick on it. Others could speak to that. I also like the oddball ideaKelly_Aquatics has a good list there, but that isn't what you asked for. I think the SDs will go with most of those in a 180. Other fish that could work in there depending on what cichlids you go with could be some large rainbows, barilius, clown barbs, rohani barbs, BA tetras, ctenopomas, snakeskin gouramis, or pictus cats.
One of my best combo of fish involved bichirs and a big pearsei. The pearsei being a vegetarian didnt eat the tilapia and raw shrimp meant for the polys and a big pearsei is very oscar like in personality but just bigger... much bigger.