but i will be adding a small rainbow shark to my tank for a little while (a friend needs it out of his current tank and is in the process of getting a larger one). will the shark and my common pleco (5 inches) be too hard on each other? i've got a cave i'm going to put on the other end of the tank from the pleco's favorite rock for the shark. also, i have swordtails and tiger barbs: are any of them likely to be harassed too much in the short time the shark will be with them?
my friend is having problems with the shark killing his bloodfin tetras (his tank is too small, again the pet store people weren't as helpful as they needed to be).