I just moved my biggest most mature silver dollar, out of the bichir tank... by the coloring, it's probably a male... I thought likely my biggest tiger was the largest, until Input them side by side.... no fighting, but tiger is afraid, initially even though this is it's tank, so I'm not sure if the caution, is because the new fish is bigger, or a male... the jr. tigers are not significantly afraid... but only after a couple minutes, and they have joined forces... sorry , a reflection covers the big tigers head... this is the tank with no main light right now, but that will be fixed in a few days
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