clown knife MAYBE attacking fish at night....what to do?

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henward

Feeder Fish
MFK Member
Jan 25, 2008
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Auckland, New Zealand
i have a 10 to 11inch ck,
in with the following

15 inch RTG arowana
big ornate
albino senegal
2x redhooks
2x spotted metynis
2x silver dollar
2x tinfoil barb
11 clown loaches ( 3 to 5 inches range of size)
1x 5 to 6 inch dat
sweetheart parrot
6bar 5 inch
8 to 9 inch flagtail

when i put the CK, this CK has a dislocated jaw from a young age, not usually fiesty, was with a 17 inch red aro before, moved it to this big tank, it was shy at first, then 3 days it resumed eating, and after 1 week, today, i noticed that it would chase other fish away from the feeding area when it wants to eat, which is relatively normal, the clown loaches would be chased away, then they would return as if nothing chased them away, the usual.
but i found that the arowana had a small nip on its fin, top of tail...dorsal fin a the back. 1 spotted metynnis had abit of its tail nipped.

should i be worried?
the only fish it could be i think would be the knife.. the dat never harasses anyone, kinda just minds its own business.

will the CKs aggression subside?
the thing is, if the CK gets too close to the aro, the aro sometimes chases it away and shows it who is boss, the ARO is definatley boss, i mean, everyone stays away from the monster lol
but at night when thehy are sleeping, the CK is boss cos he is the only one awake with the ornate and bichirs./

tank dimensions are 210cm x 83cmd x 70cmh. 1200 litres.
 
It's quite possible the CK is becoming more aggressive at night... as the environment changes (including lighting) so can the odds of who's the boss...

The CK could also be threatening someone else's position which makes them show more aggression this week then they did before he should up... new arrivals often tilt the balance on a mellow tank...

This could be a minor ripple int he blanace that will work itself out and everyone will find their place... or someone may need to take someone else out to secure their possition... Simply put, there are no promises when we start mixing potentially aggressive fish.

Tomorrow is Friday, get yourself a 6 pack and a flash light and find out what's going on ;)
 
What's the decor like? It's happened to me a couple of times. Nothing to really worry about, especially if you have fish that can hold it's own, but since you have some pretty timid fish, I'd say try to rearrange the tank and see how it goes.
 
CKs are eating machines...especially at night!

Only thing you can really do is segregate or get rid of the knife.

He's going to eat anything that will fit in his mouth and he's going to grow like crazy.
 
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