Help me eliminate potential fin nippers

[revernance]

I'm planning to put in some expensive show guppies in one of my living room tank. Before I do this, I decided to test things out by using cheaper guppies.
Yesterday I put in a black delta tail, and woke up the next morning with torn caudal fins (it's not bad, small bits torn). I removed the neon tetras (I heard they were somewhat nippy). I added in a red tailed delta today. When the lights came on, it had a much bigger torn tail.



Suspects:
Ghost shrimps. (1.5 inch plus) I noticed that when I put in these red tailed guppies, more ghost shrimps came closer to the surface. I actually saw them try to grab on the tail.
There's a bolivian ram, but she's always been peaceful. She always keeps to herself.
Endlers: not likely, they seem to keep to themselves.

What does everyone think?

[Axelrodi202]

Most likely the ghost shrimp. Depending on what species you're getting, some of them can actually be quite aggressive.

[revernance]

Originally Posted by Axelrodi202

Most likely the ghost shrimp. Depending on what species you're getting, some of them can actually be quite aggressive.

Mine are huge. A few of them scraped me when I was doing water changes and it felt like tiny pin pricks.

So I have one vote for ghost shrimp.

[aschaal03]

I'd vote for the ghost shrimp as well. I've never seen any of my 3 bolivians nip a fin, even on each other. They are all talk, they never do any damage.
Endlers are related to guppies and are very peaceful..I have a hard time believing they'd nip a guppy.
Ghost shrimp I've never owned(I have cherries), but shrimp are weird and opportunistic. I wouldn't put anything past them.

[lauraleellbp]

Guppies are quite capable of nipping each others' tails, too.