Question about YOYO loach

[tampa]

In the last few days I've found a few of my fish in the 55 gallon tank d.ead. They were 3 Angels (body size about a 1/2 $ size or slightly larger) and a Serpae Tetra.
The only fish that I have noticed having aggressive tendencies towards the Angels and Serpae in the tank were the 2 Yoyo loaches (about 1 inch to 1 1/4 " long) and a 1 1/2" Rainbow shark (Black body and all fins are red). The other fish that I have in the tank besides the remaining Angels and Serpae are clown loaches, small cory catfish, and a Synodontis catfish.
I have tested the water and found excellent readings for the Amonia and Nitrite. I have not added any new fish within the past month or so.

Is it possible (probable) that either the Yoyo or the shark are the culprits ?

 

[mgamer20o0]

well rainbow sharks tend to get aggressive but most of the time its when they are adults. have you been watching the tank to see if they are chasing them?

 

[JustOneMore20]

I've had Yoyo Loaches that nip/harrass angels before, so its a possibility. Did the dead fish have any fin damage?

 

[johnny_zanni]

In the last few days I've found a few of my fish in the 55 gallon tank d.ead. They were 3 Angels (body size about a 1/2 $ size or slightly larger) and a Serpae Tetra.
The only fish that I have noticed having aggressive tendencies towards the Angels and Serpae in the tank were the 2 Yoyo loaches (about 1 inch to 1 1/4 " long) and a 1 1/2" Rainbow shark (Black body and all fins are red). The other fish that I have in the tank besides the remaining Angels and Serpae are clown loaches, small cory catfish, and a Synodontis catfish.
I have tested the water and found excellent readings for the Amonia and Nitrite. I have not added any new fish within the past month or so.

Is it possible (probable) that either the Yoyo or the shark are the culprits ?

Thats not a rainbow shark, its a red tailed black shark

 

[JustOneMore20]

Its a Rainbow Shark. The Red Tailed Black Sharks just have a red tail, not other red fins.

http://dsmfishgal.typepad.com/aquaria/2007/11/red-tail-shark.html

 

[Bige]

The yo-yo will harrass but dont usually kill. They act like a puppy. The rainbow shark will skin the side of the fish. Look on the dead fish for marks similiar to those that the shark leaves on the glass (when they nibble algae). They will leave that same mark on the fish.