I don't think tigs really need a powerhead, if that's the question. Other may disagree. All mine are in 240 gal tanks with 2500 GPH turnover from the filter. That's all the agitation they get.
For the small ones just set up a small power head and a rock in front of it. The tig will perch itself in front of the current. My big tig I don’t think really cares although I have a ton of water movement in the tank