My Black Find Sharks

[jessierae]

i have 3 black finned sharks and i have this one that keep going to the bottom of the tank after it eats. and it will stay there till one of the other sharks go and nudge it and it will swim for a lil bit and go right back to the same spot.. 

 

[sawickib]

do you mean bala sharks, or silver tipped sharks? What size tank do you have? What are the water parameters, i.e. ammonia, nitrite, nitrates? Did you add anything to your water recently? 

 

[Ch4rlie]

Perhaps mean Columbian Shark , sometimes referred as Black Fin Shark?
 
http/badmanstropicalfish.com/profiles/profile63.html

 

[sawickib]

Unless you have a marine set up of over 1000 gallons and have actual black tip sharks.