mine are the psuedodoras niger, the torkosui(i dunni who its spelled) it is the one i saw kept with tiny tetras, or the mekong giant, they can be kept with 3 inch giant danios!! and they are nearly 7 feet long!!! i disagree with oscar, mine was the meanest fish ever, he died of ich, i am now glad he might have killed my girls(my jds)