Hmm okay, do firemouth cichlids have to be in groups? Could i just do a single one or pair?I would go with an Ornatus vs the Pictus. The Pictus are a smaller catfish and could be easily eaten by an adult Texas. The Ornatus is bigger and would be less of a risk.
You have to remember that if it can fit in a Cichlids mouth, they will try and eat it.
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Catfish have barbs in thier fins that could kill your Texas if it tries to eat them.
Same with the Rainbows. If it can fit it will try to eat it at some point.
1 Texas
1 Oscar
1-2 Firemouth Cichlids
1 Salvini
6-8 Congo Tetras
5-6 Bichirs