Which of my fish is eating my plants?

Hey,
So I recently dirted my tank and planted it heavy! My Italian val is reproducing already yay! Except, problem, my new vals that are popping up keep disappearing..ugh. Fish are eating them. Along with the young leaves of my taller plants. So here's my fish, can you tell me what the most likely vegetarians are in my tank that are enjoying my plants so much...
-clown barb
-tiger barb
-clown loach
-tiger loach
-rhino pleco (that's the one I expect)
-hatchetfish (I know they eat plants but they never go to the bottom of the tank)
-columbian tetra
-marbled headstander
-elephant nose

Oh and this is important: any new growth is being eaten from most plants even my Anubias! That was shocking to me cuz I know fish usually leave them alone. Also my amazon swords' older leaves are getting the centers eaten haha. New holes punched and eaten like caterpillars would.

Thanks everyone!

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Comment by Hunter P. on December 26, 2012 at 8:40pm: maybe snails?

Comment by Aaron Lewis on December 26, 2012 at 11:56pm: Yeah do u have any snails?? and if not i think it would be the pleco.

Comment by Brandon Everett on December 27, 2012 at 12:04am: Nah no snails except maybe some small ones that came in on plants but my loaches prolly ate all those.
I'm thinking its my marble headstander actually. They are apparently renowned plant eaters haha. Got him out and into quarantine tank along with my Colombians that I don't want anymore. On Thursday ill be selling them to the local fish shop. The pleco is also out and in another tank. Now lets see if the destruction stops!

Comment by GSP on January 1, 2013 at 3:10pm: I'd guess headstander too. Pleco might damage broad leafed plants (swords).

Never seen this habit in any hatchets.