Tom500;2381772; said:Id say that the idea of an 18" clown knife eating an 8" bichir is a completely rediculous one. I have an 18-20" clown knife in my tank and the mouth even when it yawns is no where near big enough i have clown loach as small as 4" and an 8" endli in there and it has never even tried i think you will be safe as safe can be.