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That looks like the closest I have seen yet. Just googled it. I am going to have to do some research. Do you have any info on them? Mine also has the red stripe down the dorsal. Thanks. I am not 100% sure that is it yet but boy looks very very close. has the white under belly as well.
Im no expert on them but i believe they are quite rare to come by in the hobby. They can be fairly aggressive but not quite like other centrals i.e. trimac, midas etc. They tend to get around the 12inch mark for males and 8/9inch for females. They colour up nicely as they get bigger. Going by the colour and shape i would say yours is very young and prob around the 3 inch mark.
I would say for now he is probably trying to create territory in the tank. Try breaking up the line of sight as this may help with aggression. He should be okay in that size tank for a while but if you do keep all the fish you mention you will need to upgrade eventually!
Your best bet is to research these guys on the net as much as you can.
If you do have a lyonsi, you have a much rarer fish than you green terror and severum that is for sure, so worth considering should you have to chose between them.
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