female krib aggression towards male

[Cobyx]

From the pic, I'm convinced they're a male-female pair - the male's the one at the top, his tail's the giveaway.
Tank size is indeed a major concern here; at 60 litres, it's half the recommended minimum for their behavior. Until you can upgrade - and I strongly advise that - my earlier suggestion about using tall plants or wood to create a divider still stands. The male desperately needs a safe haven, a place to escape her line of sight.

[betonx]

Thanks for the advice. I've turned over a piece of bogwood which seems to have thrown her off a bit, giving him a chance to get to the bottom and sift through the gravel. Hopefully rearranging her territory will help calm her down.

[Cobyx]

That's a temporary solution, but I think you'll need to do more in the long run. Kribs are fantastic fish, they can breed in aquariums and make a wonderful display for the owner. They're definitely worth keeping, I loved mine. I stumbled upon them by chance at a large pet store, they had a pair that had been traded in and were selling them for $5 each, which was a great deal. After doing some research, I decided to take them home.

[betonx]

Sounds like we had similar experiences. I'd never seen them before either, but I'm still hoping mine will get along. I'm starting to think this is just normal behaviour for them, but it's a bit worrying. Do you think they'll ever calm down and stop fighting?

[ridera]

Getting a pair of Kribs to get along is a gamble, it can go either way. I've seen it work out, and I've seen it end in disaster. If you're set on keeping a pair, it's worth observing the store tank for a while to see how they interact. Look for the dominant pair that's pushing the others around and claiming their territory.

In the meantime, giving each Krib their own cave in opposite corners can help. Use your bogwood and other decorations to create a visual barrier, making it harder for them to see each other. This can help reduce aggression, but it's not a permanent solution.

To be honest, a 60cm long tank just isn't enough for Kribs. They need space to move around and claim their territory. A minimum tank size of 90x30x30cm would be a big improvement, and even that's not ideal if you plan on keeping them with other fish that might get caught in the crossfire when they breed.