+1 nothing bad, just not the type most keep in their tanks, google zoanthids and palythoas lots of nice varieties, like Denny mentioned above they contain palytoxins so use caution when handling these as the toxins in them are deadly in cases, best to use gloves and avoid eye contact or ingestion
most people keep plays and zoas I myself have about 24 varieties Denny probably has what 1000? Is that accurate Denny