I had 3 sharks in the one tank once, but at the time I owned 4 (the one that just died wasnt in this one at the time) They all got along fine untill the large female got to around 8" then she started to get pretty edgy and would snap at the other sharks and cichlids.
She then killed the small albino black shark (mind you this little guy a temper and a half on it and I dont think i would of been able to keep it with anything) A week later it killed the smaller black shark at about 4-5".
After that, and also talking to Wayne and Cichlas I got to know the sex of these sharks so I put my male in with this large female......man that was one big mistake!!! they fight like how you see those large Salt Water sharks fight! I took my male out after about 4 mins or so and never put them back togeather.

I now see all you guys with so many sharks (pricks!) and some are in the same tanks as well, how do you guys do it?? or what sharks go with what??
I really want to know as my addiction for these guys has really growing now.

Hmm good question lol...well i find that youl get away with keeping sharks together when there smaller once they start to grow more the aggression will grow and then i would never keep 2 sharks of the same species together, a couple of months ago i had a major leak in one of my tanks and had to house my 10in black shark in with my 20in black shark and it was mahem the bigger one wouldnt rest while the other shark was in his tank chaseing and rasping him.

So my advise would be keep sharks together as juvi's but not the same species and if mixing large sharks together just try it and see what you can get away with but you will have aggression and fights its unavoidable with labeo's especially at feeding times.

I'd agree with Wayne. I am currently trying 3 labeos togther at the moment to see how it goes, all of them are in the 3 to 4 inch range. Albino black, parvus and coubie. The coubie is the main aggressor so far with the parvus second and the albino black shark the whipping boy. So far nothing to serious but if any of them look to be getting beat up too bad then I will seperate as I don't want to lose any of them. From what Wayne has said with his ones, the parvus is more aggressive than the rest so there must be some individual personalities going on with these fish. I had the rubropunctatus in with my big black shark for a week and there wasn't any trouble worth mentioning. If anything, the rubro made a bigger deal out of the black sharks attentions than was really required. Due to the openings in the top covers in my tank I decided to move the rubro out just because a couple of time he looked like he may accidentally leave the confines of the tank while moving out of the way of the black shark.