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tank - 50 gal, well rocked
fish - 20 2 year old 'kenyii' all from a homemade fry batch ( gave parents
away ), about 2-3 inches + a pleco + 1 small hap-something
diet - recently adding fresh spinich to the mix of spirilia flakes and
pellets ( light meals 2 x day)
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I know that these fish can tend to be aggressive and nasty to each other
but...

when I glanced at my tank this morning, I noticed the fish behaving
strangely...
then I saw what was happening, one of the average sized (bright-yellow)
males was being tag-teamed brutally by almost all the other fish. chased and
pecked.

he then shot straight up out of the water and hit the cover ( thud! ) then
sank back to the bottom and rested upside-down, ( his belly was white as a
ghost )
then the other fish noticed me, or were startled by the thud, and they all
guiltily-looking immedialtly hid in the rocks, just peaking out looking at
me.
( they all hid except for the hap, I guess he wasn't in on it )

tonight, I reconized the victim of this 'swarming' and he seems very timid
now, but no real damage except for a bit of shimy-ing ( on the spot
swimming )
( he did not join in on the nightly feeding either )

this is the first time I've seen such a display, but I suspect it happens
other times while I'm not a witness...

anyone have any experiences simular to this, or a psuedo-explaination
(pun-intended) for this behaviour?

Carl