04-17-2007, 11:19 PM
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In general, it's best to keep most all loaches, with notable exceptions, in groups of 5 or more. There will always be an alpha loach, and it will harass any other loaches, but if you have 5, it splits the aggression 4 ways. Also, if you have an even number of loaches, they can group up in pairs with a more dominant/less dominant loach in each, and the aggression tends to get fixed in those pairs. Doesn't always happen that way, but I am told it can. So for best loach behavior, get 3 more (though you'll need 25 to 40 gallons of capacity right there. Yoyos can get up to 6", though 5" is more usual).
That said, with yoyos anyways, it rarely progresses beyond chasing.