Community Tank Possible Aggression

VTDrew

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Bolton Valley (Resort), Vermont, USA
Hi,
 
So I recently introduced a Festivum (M. Festivus) into my tank, it was before I broke up with my girlfriend, so lets say 2-3 months.  At the time, there were 5 GloLights, 4 Zebra Danio's, 3 Turquoise Rainbows, 3 Millenium Rainbows, 3 Praecox Rainbows, Two Plecos and and Upsidedown Catfish.
 
I knew the glowlights didn't stand a chance, but the tank I was going to move them was having a little outbreak.  I asked them (haha) if they wanted to take their chances with the preditor or risk certain death with an unknown disease.  Needless, to say, I have no glolights, but had a very happy festivum for a while.
 
More recently, I've had a little outbreak of something in this tank.  Sores, missing scales and a single case of dropsy which has been going on for a while.  Also a really odd protusion on one of the Praecox behind the a fin.  I checked the water conditions, ammonia was high (0.5-1ppm) so I've reacted to that and I think I have it under control, even the dropsy fish seems to be slimming down.  I've had this really odd feeling though that the sores created the infections and George (the Festivum, get it, Seinfeld) is responsible.
 
Anyway, consider the glolights, the mystery missing danio (it happened during a 75% water change/super gravel vac that he went missing...water was low, no places to hide).  Now, I just found my largest millenium (4") dead and snacked on.  This had to happen rapidly, everyone was fine an hour ago, and I caught George red handed taking a few bites.  Fins were flared and he was clearly guilty.  I thought these guys were not supposed to be aggressive against non-food sized community members.  is it possible George is responsible for everyone's injuries?
 
If yes, he clearly likes his food live.  What should I be feeding him that would keep him away from everybody else.  He's still young, 5" total length.  I want something he can eat, but eat fast enough that they won't be contributing to the nitrogen cycle.  Perhaps something I can keep in my small tank, will look nice and easy to catch when its time for George to eat.  In that tank I have 5 Neon's, a single guppy (his mate died and will be replaced), a pleco and a red/white/blue dwarf gourami.
 
The last option would be to move George to the big tank.  I don't think he will do well with the Leporinus, Pictus Cat or Venustus.  Please don't comment on the fish stock, I bought the tank on craiglist pre stocked.  I've already had to pull one Lepo out for almost killing the other lepo (who has no eye, was finless, covered in wounds, got dropsy, recovered, and now makes a habit of killing just about anything new I put in).  There are no live plants in there for George to snack on (which he loves) because the Silver Dollars don't understand conservation.  He will be very unhappy.
 
Not a lucky fish quarter.  Last month, a bala shark went missing mysteriously at the same time my dog came down with violent diahreha.  Not fun looking for a dead fish while taking the dog out every hour and still constantly cleaning up his accidents.  Not fun!  I'm pretty sure the bala escaped my well covered tank and the dog had a snack.
 
It sounds like youve had a rough time lately, im sorry to hear that but I wouldn't be so quick to blame.the festivum for sores or deaths, the fact that he was snacking on a dead fish isn't surprising, but any fish that is omnivorous or carnivorous will take advantage of free meat that can't fight back.

I have a male festivum that was so aggressive I had to rehome all of the other festivum in the tank except his mated female, but his aggression toward the other species in the tank has never escalated beyong fin nipping and occasional charging.

I think the fish deaths you've had resulted from the ammonia spike, which would have severely weakened their immune systems and possibly poisened them, not to mention enhance any aggressive behavior due to irritability. The fact that George has munched dead fish doesn't mean he necessarily killed it. But if you want to give the other fish a break from him you can try adding more plants or wood or caves, and rearrange the tank in such a way that it breaks up long lines of sight, that way the smaller faster fish can get out of his way and out of his sight quickly.
 
Well, after a week of hard work, adding bacteria and water changes, it looks like my numbers are back to:
ph:7.7
ammonia: 0
Nitrite: 0
Nitrate: 5-10
 
All that's left is to wait.  I still thing George is responsible for the injuries.
 

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