[untamed]

My tank has at least three tiger tails...at least three donkey dungs...and 1 unknown red/black one. Has been like that for two years. Because I don't really see them all at once, I couldn't tell you if any have died or done anything dramatic, but the tank hasn't crashed....so...so far so good.

I agree that they are solely interested in staying on the sand bed and show no interest in climbing up walls toward where powerheads might be.

Recently, it would seem that the donkey dungs have reproduced. My sump has possibly 100+ baby dungs living in it.

It has been speculated by some that recent coral deaths might be attributed to the death of one or more of my cucs...but there is a lot of speculation on what has killed some of my coral. Stories I've heard about "cuke nuke" usually include fish deaths and all my fish seem just fine.

So...maybe you don't get as carried away as me...but I give the donkey dung and tiger tail a good endorsement. They are very effective sand cleaners and I haven't had a problem with them. Personally, I think that if any large, soft bodied animal is permitted to shred itself in a powerhead it is going to cause problems for one's tank. An anemone might be another good example.