Hi -
I have a 26 bow and have 2 multi banded pipes, a bluestripe and an allegator pipe. They all get along fine, eat mysis like little piggies and they do swim around quite a bit. They really do like to hide/swim/play in the rockwork and the grass. I wouldn't put them in a smaller tank than 26.
The trick is to get them eating mysis ... the bluestripe has just started eating mysis after about 9 months of coaxing. He finally learned from watching the multibandeds.
Good luck.