Look into a nassarius snail, they are awesome bottom dwelling scavengers with a keen smell to death. If it’s dead, they’ll find it and eat it. You do have a lid on your tank? Just to rule out any possibilities of them Evel Knieveling out of your tank to be eaten by a dog or cat... don’t feel bad. I lost my first clown I had, water parameters were fine. I noticed stringy poop and then a few days later he started to lose color and get weak. I’d imagine your tank is still safe for coralsThe last 7-10 days have been discouraging and a major setback. Just over a week after adding the two clowns I noticed the Davinci clown was having some white stringy poop. After research and consulting the LFS we decided to change their diet from frozen mysis, since this ban be a benign cause and it was behaving regularly. Two days later I went to bed and both were normal only to wake up to the Davinci having vanished. All water parameters were checked as I was monitoring every 3 days since addition of fish and were normal. Checked out of the tank, filters, everywhere imaginable with no signs. Assumed the emerald crab either killed it or found it dead (would it really go downhill in <8 hours that fast) and dragged it deep into the rock.
Started testing water and 2-3 days later saw some ammonia building. Other clown was still acting as it had since I added them with no signs or symptoms of issues. Then it happened again! Went to bed clown acting fine, less than 8 hours later GONE! Once again searched everywhere and even took out the rock to look into nooks and crannies with a flashlight with no luck. 2-3 days later tested water again and ammonia is still on the rise. Pretty sure the crab is pulling them into the rockwork deep because he disappears for days (during day and night) after they disappear. Unfortunately, I don't know if he is killing or scavenging. Either way, the decision was made that he will be removed to eliminate one variable moving forward.
Unfortunately, I have not been able to find where the remains are to remove them to prevent ammonia build up. I am going to try again to remove and thoroughly search the rock a third time. Otherwise, I am forced to wait weeks while the bodies decompose and ammonia returns to zero. Then I will be able to try again adding some inhabitants and eventually corals.
Tough break going from 2 days away from adding the first corals to being set back past zero. The most frustrating part is not knowing what the cause was, if it was bad luck, keeper error, or rogue crab. Not overly convinced it was disease as they were acting relatively normal for clowns, eating, and no visual issues besides some minor fin damage that I would chalk up to regular "clowning around".
Hopefully better things are to come.