[untamed]

Originally Posted by JDigital

Have you had any problems with abrasive scratches from Tangs other than the one you mentioned in your build thread?

The tangs do scratch the tank with their spines...and one (or both) of the urchins leaves quite nasty scratches when they scrape the coraline off. Those scratches don't bother me much because they are in spots where I don't attempt to clean (hence the coraline grows there)....but..yes, the urchins can scratch the acrylic. It could very well be that they can't do it until they get to a certain size. My Hatpin urchin is probably 12" across now and I suspect that is the one that is making the marks.

The fish scratches are pretty light and relatively easy to polish out. They don't bother me much. The only problem is that the scratch provides a spot for algae to anchor such that the mag cleaner doesn't clean it off as easily.