What's Killing My Cherry Barbs ?

I'm a little new to this fish stuff I've been doing it over a month now , but anyway I'll cut to the chase my cherry Barb's are dying one by one I've noticed there tails are torn and shrinking back and they are covered in red dots, I lost 3 in one day ,and one seems to have a single red dot in the middle of it's body and his tail is also as if something ate it up,it also refuses to eat , my other 3 acted the same way one little red dot than hours later covered in red dots sunk to the Bottom ,wiggled a bit and died I also have other fish in 20 gallon tank who seem fine they eat , swim around ,fight ,play ....
6 Blackskirt tetra
1 rainbow Shark
1 dwarf gourami
5 cherry barbs I had more they died
I'll try and get a pic of the dead one cause I need to know wats going on also my water find I tested everything ,except for the pH it's 7.6 and refuses to go down no matter wat I do , I Would appreciate a answer before it's too late !!! Thank you

 

 

Hello somebody ??? Wat is causing this ??I need answers !!!

 

Could be the rainbow shark attacking them, they can become very territorial when put in such a small tank.

 

Could be the rainbow shark attacking them, they can become very territorial when put in such a small tank.

Well than y isn't he attacking my Blackskirt tetras ?

 

That is textbook Viral Hemorrhagic Septicemia. You need to remove and cull the rest of the cherry barbs you have and hope your remaining fish don't have it.

ALWAYS quarantine new fish!

 

I was going to say it looked like septicemia too, but will quarantining and Kanaplex not help the remaining ones?

 

K thank you for the answers one of my barbs with the little red do seems better the dot looks like it's going away ,so if this was septicemia he'd b dead by now cause I've noticed it for about 4 to 5 days on him ,and also how fast does this disease hit fish the dead one I posted a pic of I didn't notice anything red on him ,went to bed the nxt morning he was covered and also look at his tail it's half missing I just hope I actually find out wath is causing this before everything dies , ughhh it **** me off!!!

 

Well than y isn't he attacking my Blackskirt tetras ?

Also Sion I removed my rainbow shark to new tank till I figure out wats going on I was just starting to like the lil lil critter.

 

It might be that the barbs are the only ones that get it.