Hi guys, need some advice for clown knife fish tankamtes, last week I found my nearby fish shop have knife fishes arrived, I bought one yesterday, this knife fish is about 2-3 inch long, I put him with my red tail and paroon, today I went back from school and found my paroon's fin heavily injured and a dried red tail catfish, already separated them I am frustrated at clown knife tankmates, if you had any advices please let me know