Anyone else have a 'peaceful' fish that is really aggressive?

[Balistik928]

I have this normal Kribensis that somehow grew to about 5 inches long and is hyper aggressive. This thing even chases my Rainbow Shark. So here's where I put him for now.
Anyone else have an experience like this with a fish that should be peaceful? Let me know if you have.

 

[jaws7777]

I had a pearsei that i thought would have been on the mild side. But turned into a nightmare. I had to rehome more fish than i could remember because of his antics. It was worth it though he was a great fish

 

[fishhead0103666]

My second blue gourami turned out to be an absolute nightmare.

 

[HybridHerp]

Every single angelfish I’ve ever had has been an aggressive SOAB, and not even like expected aggression levels like terrorizing parrotxflowerhorn hybrids and a full grown Oscar aggression levels lol

 

[tlindsey]

I personally don't classify any specie of Cichlid as peaceful. Makes me laugh every time. I once had a female Kribensis kill 2 males.

 

[Backfromthedead]

I always chuckle when i see pink gouramis at stores labeled as peaceful community fish. ime they are indiscriminate killers and try to eat anything that can partly fit in their mouth.

 

[J. H.]

I have this normal Kribensis that somehow grew to about 5 inches long and is hyper aggressive. This thing even chases my Rainbow Shark. So here's where I put him for now.View attachment 1373365
Anyone else have an experience like this with a fish that should be peaceful? Let me know if you have.

Is this what you have? Sounds like it's not a Pelvichromis pulcher or kribensis that you usually see.

Wallaceochromis humilis summary page

www.fishbase.se

 

[Rob909]

I always chuckle when i see pink gouramis at stores labeled as peaceful community fish. ime they are indiscriminate killers and try to eat anything that can partly fit in their mouth.

+1 for gourami being killers! Had a red tail gourami that was terrorizing my tank for a while.

I also had a lone turquoise rainbow fish with small Bala Sharks and it would wait until they grouped together, then torpedo toward the shoal and send the balas into a frenzy, darting all over the tank.

 

[duanes]

What size tank is it in?
I find that tank size (or lack thereof) is almost always the main factor in aggression.
I have just the opposite opinion as tlindsey (respectfully), I don't see any cichlid as aggressive, but if it is, its in the wrong size tank.
An example I've read tons of posts about how mean festae are, I combined them with many other cichlids in my tanks, and never had a problem.

 

[jaws7777]

Pearsei was in a 150 then 300, and was pretty much always cranky