I have an 18" longnose gar with a 3" green severum, 4" gold severum, 5" blood parrot, 2x10-14" rope fish, etc, etc...the only thing he tries to eat is a 3" pictus catfish. Stay away from silver fish. Gar like to eat those. He's also been housed w 3 Africa clawed frogs that routinely stand on his head a green terror and a banded leporinus. Nothing has ever bothered him and he hasn't bothered anything, except the pictus...had to pull him out of his mouth twice, we now call him scarface. Also have a 5" Florida gar in grow out with a 2" silver dat. No problems. The gar acts like he wants to eat the I.d. shark of the same size though. He's never tried, he has stalked though.
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