blue zebra male gone nuts

[RedRain5]

blue zebra male gone nuts! HELP! he's even after me

My blue zebra male has lost it he's out of controle!
He has three females with him and has mated atleast once but he is singiling out one of the females and totaly beating the crap out of her trying to forse her into his nest. The others he's acting prety normal twords. I put my hand next to him to chase him off and he atacked me.I hooked him with my finger nail to get him off of me he has a nasty little scrape( I feal bad about hurting him) but he's still looking for that female(I took her out) and he's prety much ignoring the other girls. The last time he mated it was with one of the ones he is now ignoring.
The other fish in the tank (red zebras ,yellow labs, CAE, and ferrel minnows as dither fish) may as well not exist. It's like he dosn't even know they are in the tank and he's even ignoring the red zebra male that he usualy chases just a little when he gets too close to his hiding hole. This is resent behavior in the last few days he's never acted like this before I havn't changed any thing the tank is the same as It has allways been. I've had the fish about a year now I rased them from fry. I'm upset that he atacked me the way he did. All my other fish are so well behaved and are nice to their girls and are makeing babbys with out so much as a niped fin(well a little troubble with a young lab female pestering the other female when she was holding but she has calmed down and is now holding) but he's gone crazy or something
He didn't act this way the first time he was trying to mate with them I didn't even know he had
is there any way that I may be able to calm him down? maby change the water temp a bit or something I know water temp can help make them want to breed?

 

[RedRain5]

any one? I'm really concerned about the way he's acting it's freeky he just changed over night ...?

 

[kay-bee19]

Mbuna tend to get more aggressive as they go from juvies to fully matured adults.

Are you completely sure of the gender of the 'female' being pursued by the dominant male blue zebra? (any chance it's actually a sub-dominant male?

55gal tank, right?

Hard to say for sure what is setting him off all of a sudden. Assuming it is a female he chases, you could add another trio of female blue zebras or permanently remove the dominant male (sell it, etc).

Or add a slightly greater number of blue zebras, if your tank can support them. Additional females and potential rival males could significantly alter the dominant's focus of attention (this option, however, may have the potential to make matters worse).

Or you could temporarily remove the male (for 1-2 weeks), completely rearrange the tank and reintroduce the dominant male after that time has passed.

 

[RedRain5]

I'll try that thanks yea it's a female he's trying to make her go into his nest under a big rock he's been matured for a while and he did start chaising that red one a bit after he matured but only when he comes around his rock! no ide why he harases this one so much all of asudden he didn't when he breed the first time
any thing else I can do because rearanging that tank is a pain and I don't want to have to keep doing it each time he setels in and gets agresive