As far as I know, they are fine in community tanks. I have three in with my angels and there has never been any issues. Remember though that they get up to 6 inches long. Also, sometimes false algae eaters get sent in with true algae eaters. The easiest way to tell a true Siamese algae eater is the black stripe goes all the way through the tail and some of the false algae eaters will have a lighter stripe on top of the black stripe. Enjoy your fish they're cool to watch.