They are also on the wrong side of reef safeness, my older one picked on my favia and brain coral endlessly.
My older one I got out of tmc box from Sheldon, but still struggled with it at the start, it did not want to eat. So I put it in my 1000 liter sump with lots of LR for a few months and it did well. I still don’t see it eat food I put in, but it stays fat, so has to be eating something. The newer one which is from Phillipines seems to be eating pellets. I initially got 2 new ones from Phillipines as I expected one might not make it, and it didn’t. They are a lot cheaper from non-tmc suppliers but you get what you pay for in the end, super lucky with mine eating pellets.